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Java Development Case Studies And Success Stories

by Ideamotive Talent

Take a look at these Java case studies to see how our developers have served clients in numerous industries. With each project analysis, you’ll be able to shape a general impression about our developers, their experience, and their skills. Every time we’re making our best effort to enhance the clients’ business and strengthen their positions on the market.

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13.5: Case Study- Designing a Basic GUI

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• Ralph Morelli & Ralph Wade
• Trinity College

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What elements make up a basic user interface? If you think about all of the various interfaces you’ve encountered—and don’t just limit yourself to computers—they all have the following elements:

Some way to provide help/guidance to the user.

Some way to allow input of information.

Some way to allow output of information.

Some way to control the interaction between the user and the device.

Think about the interface on a beverage machine. Printed text on the machine will tell you what choices you have, where to put your money, and what to do if something goes wrong. The coin slot is used to input money. There’s often some kind of display to tell you how much money you’ve inserted. And there’s usually a bunch of buttons and levers that let you control the interaction with the machine.

These same kinds of elements make up the basic computer interface. Designing a Graphical User Interface is primarily a process of choosing components that can effectively perform the tasks of input, output, control, and guidance.

In the programs we designed in the earlier chapters, we used two different kinds of interfaces. In the command-line interface, we used printed prompts to inform the user, typed commands for data entry and user control, and printed output to report results. Our GUI interfaces used JLabel s to guide and prompt the user, JTextField s and JTextArea s as basic input and output devices, and either JButton s or JTextField s for user control.

Let’s begin by building a basic GUI in the form of a Java application. To keep the example as close as possible to the GUIs we’ve already used, we will build it out of the following Swing components: JLabel , JTextField , JTextArea , and JButton .

The Metric Converter Application

Suppose the coach of the cross-country team asks you to write a Java application that can be used to convert miles to kilometers. The program should let the user input a distance in miles, and the program should report the equivalent distance in kilometers.

Before we design the interface for this, let’s first define a MetricConverter class that can be used to perform the conversions (Fig. 13.9). For now at least, this class’s only task will be to convert miles to kilometers, for which it will use the formula that 1 kilometer equals 0.62 miles:

Note that the method takes a double as input and returns a double . Also, by declaring the method static , we make it a class method, so it can be invoked simply by

Choosing the Components

Let’s now design a GUI to handle the interaction with the user. First, let’s choose Swing components for each of the four interface tasks of input, output, control, and guidance. For each component, it might be useful to refer back to Figure [fig-swing2-guis] to note its location in the Swing hierarchy.

A JLabel is a display area for a short string of text, an image, or both. Its AWT counterpart, the Label , cannot display images. A does not react to input. Therefore, it is used primarily to display a graphic or small amounts of static text. It is perfectly suited to serve as a prompt, which is what we will use it for in this interface.

A JTextField is a component that allows the user to edit a single line of text. It is identical to its AWT counterpart, the TextField . By using its getText() and setText() methods, a JTextField can be used for either input or output, or both. For this problem, we’ll use it to perform the interface’s input task.

A JTextArea is a multiline text area that can be used for either input or output. It is almost identical to the AWT TextArea component. One difference, however, is that a JTextArea does not contain scrollbars by default. For this program, we’ll use the JTextArea for displaying the results of conversions. Because it is used solely for output in this program, we’ll make it uneditable to prevent the user from typing in it.

Let’s use a JButton as our main control for this interface. By implementing the ActionListener interface we will handle the user’s action events.

Choosing the Top-Level Window

The next issue we must decide is what kind of top-level window to use for this interface. For applet interfaces, the top-level component would be a JApplet . For Java applications, you would typically use a JFrame as the top-level window. Both of these classes are subclasses of Container , so they are suitable for holding the components that make up the interface (Fig. [fig-swing1-guis] ).

Also, as noted earlier, JApplet s and JFrame s are both examples of heavyweight components, so they both have windows associated with them. To display a JFrame we just have to give it a size and make it visible. Because a frame runs as a stand-alone window, not within a browser context, it should also be able to exit the application when the user closes the frame.

Designing a Layout

The next step in designing the interface is deciding how to arrange the components so that they will be visually appealing and comprehensible, as well as easy to use.

Figure [fig-metricgui] shows a design for the layout. The largest component is the output text area, which occupies the center of the JFrame . The prompt, input text field, and control button are arranged in a row above the text area. This is a simple and straightforward layout.

Figure [fig-metricgui] also provides a containment hierarchy , also called a widget hierarchy , which shows the containment relationships among the various components. Although it might not seem so for this simple layout, the containment hierarchy plays an important role in showing how the various components are grouped in the interface. For this design, we have a relatively simple hierarchy, with only one level of containment. All of the components are contained directly in the JFrame .

Figure 13.11 shows the design of the Converter class, which extends the JFrame class and implements the ActionListener interface. As a JFrame subclass, a Converter can contain GUI components. As an implementor of the ActionListener interface, it also will be able to handle action events through the actionPerformed() method.

Figure [fig-converterclass] gives the implementation of the Converter class. Note the three packages that are imported. The first contains definitions of the Swing classes, and the other two contain definitions of AWT events and layout managers that are used in the program.

We have to do all initializing tasks in the constructor. First, we have to set the JFrame ’s layout to FlowLayout . A layout manager is the object that is responsible for sizing and arranging the components in a container so that the elements are organized in the best possible manner. A flow layout is the simplest arrangement: The components are arranged left to right in the window, wrapping around to the next “row” if necessary.

Second, note the statements used to set the layout and to add components directly to the JFrame . Instead of adding components directly to the JFrame , we must add them to its content pane:

A content pane is a JPanel that serves as the working area of the JFrame . It contains all of the frame’s components. Java will raise an exception if you attempt to add a component directly to a JFrame .

The JFrame and all the other top-level Swing windows have an internal structure made up of several distinct objects that can be manipulated by the program. Because of this structure, GUI elements can be organized into different layers within the window to create many types of sophisticated layouts. Also, one layer of the structure makes it possible to associate a menu with the frame.

Finally, note how the Converter frame is instantiated, made visible, and eventually exited in the application’s main() method:

It is necessary to set both the size and visibility of the frame, since these are not set by default. Because we are using a FlowLayout , it is especially important to give the frame an appropriate size. Failure to do so can cause the components to be arranged in a confusing way and might even cause some components to not appear in the window. These are limitations we will fix when we learn how to use some of the other layout managers.

Inner Classes and Adapter Classes

In this section we introduce two new language features, inner classes and adapter classes , which are used in the main() method shown above to handle the closing of the Converter application’s window when the program is exited:

This code segment provides a listener that listens for window closing events. When such an event occurs, it exits the application by calling System.exit() .

The syntax used here is an example of an anonymous inner class . An inner class is a class defined within another class. The syntax is somewhat ugly, because it places the class definition right where a reference to a window listener object would go. In effect what the code is doing is defining a subclass of WindowAdapter and creating an instance of it to serve as a listener for window closing events.

Anonymous inner classes provide a useful way of creating classes and objects on the fly to handle just this kind of listener task. The syntax used actually enables us to write one expression that both defines a class and creates an instance of it to listen for window closing events. The new subclass has local scope limited here to the main() method. It is anonymous, meaning we aren’t even giving it a name, so you can’t create other instances of it in the program. Note that the body of the class definition is placed right after the new keyword, which takes the place of the argument to the addWindowListener() method. For more details on the inner and anonymous classes, see Appendix F.

An adapter class is a wrapper class that implements trivial versions of the abstract methods that make up a particular interface. (Remember from Chapter 4 that a wrapper class contains methods for converting primitive data into objects and for converting data from one type to another.)

The WindowAdapter class implements the methods of the WindowListener interface. When you implement an interface, such as ActionListener , you must implement all the abstract methods defined in the interface. For ActionListener there’s just one method, the actionPerformed() method, so we can implement it as part of our applet or frame class. However, we want to use only one of the seven methods available in the WindowListener interface, the windowClosing() method, which is the method implemented in the anonymous inner class:

The WindowAdapter is defined simply as

Note that each method is given a trivial implementation (). To create a subclass of WindowAdapter , you must override at least one of its trivially implemented methods.

Another way to manage the application’s window closing event is to define a subclass of WindowAdapter :

Given this class, we can then place the following statement in Converter ’s main() method:

This is somewhat more familiar looking than the inner class construct. If you prefer this way of handling things, you can use this method in place of the inner classes here and in other examples.

GUI Design Critique

Figure 13.13 shows the converter interface. Although our basic GUI design satisfies the demands of input, output, control, and guidance, it has a few significant design flaws.

First, it forces the user to manually clear the input field after each conversion. Unless it is important that the user’s input value remain displayed until another value is entered, this is just an inconvenience to the user. In this case, the user’s input value is displayed along with the result in the JTextArea , so there’s no reason not to clear the input text field:

A second problem with our design is that it forces the user to switch between the keyboard (for input) and the mouse (for control). Experienced users will find this annoying. An easy way to fix this problem is to make both the JTextField and the JButton serve as controls. That way, to get the program to do the conversion, the user can just press the Enter key after typing a number into the text field.

To give the interface this type of control, we only need to add an ActionListener to the JTextField during the initialization step:

A JTextField generates an ActionEvent whenever the Enter key is pressed. We don’t even need to modify the actionPerformed() method, since both controls will generate the same action event. This will allow users who prefer the keyboard to use just the keyboard.

Given that the user can now interact with the interface with just the keyboard, a question arises over whether we should keep the button at all. In this case, it seems justifiable to keep both the button and the text field controls. Some users dislike typing and prefer to use the mouse. Also, having two independent sets of controls is a desirable form of redundancy. You see it frequently in menu-based systems that allow menu items to be selected either by mouse or by special control keys.

Another deficiency in the converter interface is that it doesn’t round off its result, leading sometimes to numbers with 20 or so digits. Develop Java code to fix this problem.

Give an example of desirable redundancy in automobile design.

Extending the Basic GUI: Button Array

Suppose the coach likes our program but complains that some of the folks in the office are terrible typists and would prefer not to have to use the keyboard at all. Is there some way we could modify the interface to accommodate these users?

This gets back to the point we were just making about incorporating redundancy into the interface. One way to satisfy this requirement would be to implement a numeric keypad for input, similar to a calculator keypad. Regular JButton s can be used as the keypad’s keys. As a user clicks keypad buttons, their face values—0 through 9—are inserted into the text field. The keypad will also need a button to clear the text field and one to serve as a decimal point.

This new feature will add 12 new JButton components to our interface. Instead of inserting them into the JFrame individually, it will be better to organize them into a separate panel and to insert the entire panel into the frame as a single unit. This will help reduce the complexity of the display, especially if the keypad buttons can be grouped together visually. Instead of having to deal with 16 separate components, the user will see the keypad as a single unit with a unified function. This is an example of the abstraction principle, similar to the way we break long strings of numbers (1-888-889-1999) into subgroups to make them easier to remember.

Figure [fig-metricgui2] shows the revised converter interface design. The containment hierarchy shows that the 12 keypad JButton s are contained within a JPanel . In the frame’s layout, the entire panel is inserted just after the text area.

Incorporating the keypad into the interface requires several changes in the program’s design. Because the keypad has such a clearly defined role, let’s make it into a separate object by defining a KeyPad class (Fig. 13.15). The KeyPad will be a subclass of JPanel and will handle its own ActionEvent s. As we saw in Chapter 4, a JPanel is a generic container. It is a subclass of Container via the JComponent class (Fig. [fig-swing2-guis] ). Its main purpose is to contain and organize components that appear together on an interface.

In this case, we will use a JPanel to hold the keypad buttons. As you might recall from Chapter 4, to add elements to a JPanel , you use the add() method, which is inherited from Container . (A JApplet is also a subclass of Container via the Panel class.)

As a subclass of JPanel , the KeyPad will take care of holding and organizing the JButton s in the visual display. We also need some way to organize and manage the 12 keypad buttons within the program’s memory. Clearly, this is a good job for an array. Actually, two arrays would be even better, one for the buttons and one for their labels:

The label array stores the strings that we will use as the buttons’ labels. The main advantage of the array is that we can use a loop to instantiate the buttons:

This code should be placed in the KeyPad() constructor. It begins by instantiating the array itself. It then uses a for loop, bounded by the size of the array, to instantiate each individual button and insert it into the array. Note how the loop variable here, k , plays a dual role. It serves as the index into both the button array ( buttons ) and the array of strings that serves as the buttons’ labels ( labels ). In that way the labels are assigned to the appropriate buttons. Note also how each button is assigned an ActionListener and added to the panel:

An important design issue for our KeyPad object concerns how it will interact with the Converter that contains it. When the user clicks a keypad button, the key’s label has to be displayed in the Converter ’s text area. But because the text area is private to the converter, the KeyPad does not have direct access to it. To address this problem, we will use a Java interface to implement a . In this design, whenever a KeyPad button is pressed, the KeyPad object calls a method in the Converter that displays the key’s label in the text area.

Figure [fig-p493f1] provides a summary of the callback design. Note that the association between the Converter and the KeyPad is bi-directional. This means that each object has a reference to the other and can invoke the other’s public methods. This will be effected by having the Converter pass a reference to itself when it constructs the KeyPad :

Another important design issue is that the KeyPad needs to know the name of the callback method and the Converter needs to have an implementation of that method. This is a perfect job for an abstract interface:

The KeyPad can interact with any class that implements the KeyPadClient interface. Note that the KeyPad has a reference to the , which it will use to invoke the keypressCallback() method.

The implementation of KeyPad is shown in Figure 13.17. Note that its constructor takes a reference to a KeyPadClient and saves it in an instance variable. Its actionPerformed() method then passes the key’s label to the KeyPadClient ’s callback method.

Given the KeyPad design, we need to revise our design of the Converter class (Fig. [fig-p493f1] ). The Converter will now implement the KeyPadClient interface, which means it must provide an implementation of the keypressCallback() method:

Recall that whenever the KeyPad object calls the keypressCallback() method, it passes the label of the button that was pressed. The Converter object simply appends the key’s label to the input text field, just as if the user typed the key in the text field.

The complete implementation of this revised version of the interface is shown in Figure 13.18 on the next page. The appearance of the interface itself is shown in Figure 3.19.

Figure 3.19 shows that despite our efforts to group the keypad into a rectangular array, it doesn’t appear as a single entity in the interface itself, which indicates a layout problem. The default layout for our KeyPad (which is a JPanel ) is FlowLayout , which is not appropriate for a numeric keypad that needs to be arranged into a two-dimensional grid pattern, which is the kind of layout our design called for (Fig. [fig-metricgui2] ).

Fortunately, this flaw can easily be fixed by using an appropriate layout manager from the AWT. In the next version of the program, we employ the java.awt.GridLayout , which is perfectly suited for a two-dimensional keypad layout (Section 13.7.2).

The lesson to be learned from this example is that screen layout is an important element of an effective GUI. If not done well, it can undermine the GUI’s effort to guide the user toward the appointed tasks. If done poorly enough, it can even keep the user from doing the task at all.

Part XII Case Studies

Part XII presents case studies that use a variety of Java EE technologies. This part contains the following chapters:

Chapter 61, "Duke’s Bookstore Case Study Example"

Chapter 62, "Duke’s Tutoring Case Study Example"

Chapter 63, "Duke’s Forest Case Study Example"

Beta Draft (Pre-General Availability)

Java Programming Case Study Examples

• in Talent Insight

If you are an HR professional looking for talented Java programmers, then you are in the right place. This article will provide you with some great case study examples that showcase the skills and expertise of top Java programmers.

Importance of Case Studies for HR Professionals

Case studies are an essential tool for HR professionals when hiring top talent. They provide a deeper understanding of a candidate’s skills, knowledge, and experience, which is not always possible through resumes or interviews. By reviewing case studies, HR professionals can evaluate a candidate’s ability to solve complex problems and develop innovative solutions.

Here are some excellent case study examples that demonstrate the skills and expertise of top Java programmers:

• Google Maps : Google Maps is one of the most popular navigation applications in the world. It is built using Java and provides real-time traffic updates, street views, and satellite imagery. Google Maps is an excellent example of how Java programming can be used to develop complex and innovative solutions.
• Amazon : Amazon is the world’s largest online retailer, and its website is built using Java. The website handles millions of transactions every day, and its success is a testament to the reliability and scalability of Java programming.
• Netflix : Netflix is a streaming platform that delivers movies and TV shows to millions of users worldwide. It uses Java programming to create personalized recommendations, manage user profiles, and optimize streaming quality.

Why Choose Algobash?

At Algobash, we specialize in connecting HR professionals with top Java programmers. Our platform features a comprehensive database of talented programmers who have been rigorously tested and vetted. By using Algobash, you can save time and money while finding the perfect candidate for your organization.

Best Assessment Types for Effective Employee Selection

Trends and innovations in the world of employee assessment, shehacks 2024 to accelerate women’s empowerment.

Chapter 51 Duke’s Bookstore Case Study Example

The Duke’s Bookstore example is a simple e-commerce application that illustrates some of the more advanced features of JavaServer Faces technology in combination with Contexts and Dependency Injection for the Java EE Platform (CDI), enterprise beans, and the Java Persistence API. Users can select books from an image map, view the bookstore catalog, and purchase books. No security is used in this application.

The following topics are addressed here:

Design and Architecture of Duke's Bookstore

The Duke's Bookstore Interface

Running the Duke's Bookstore Case Study Application

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Welcome to the Clean Coders Java Case Study. This is Episode 1.

Over the next weeks and months, Micah and Uncle Bob will re-implement the cleancoders.com website in Java before your very eyes. You'll see them applying all the principles, patterns, and practices that you've been learning in the Clean Code series . But instead of learning about those principles, patterns, and practices, you'll see how they use them in real life.

The first episode is entitled Getting Nothing Done because in this episode they use the first acceptance tests in FitNesse to set up the infrastructure and facilities they need to start getting real stories implemented. They do finish one story, but it's the story of the null case.

So get ready for some fun and education and you watch these two seasoned professionals work together to create a web system in Java.

If you want to follow along with the code, you can find it on Github: https://github.com/cleancoders/CleanCodeCaseStudy

Java as a systems programming language: three case studies

Cite this chapter.

• J. M. Bishop 2  

Part of the book series: IFIP Advances in Information and Communication Technology ((IFIPAICT))

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Java is the newest in a long line of systems programming languages. This paper looks at what makes it special and backs the findings up with three case studies. The projects exercise Java to the full — its features and APIs. The first is a Web Computing Skeleton for remote execution of collaborative programs. The second provides open query mechanisms to a spatial database. The third expands a distributed algorithm visualisation system. Issues of performance are discussed, as well as alternative ways of approaching the solutions. In general the results are positive and Java comes out as a worthy language for undertaking research in distributed systems.

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Bishop, J.M. (1998). Java as a systems programming language: three case studies. In: Horspool, R.N. (eds) Systems Implementation 2000. IFIP Advances in Information and Communication Technology. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-35350-0_6

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• Java Arrays
• Java Strings
• Java Collection
• Java 8 Tutorial
• Java Multithreading
• Java Exception Handling
• Java Programs
• Java Project
• Java Collections Interview
• Java Interview Questions
• Spring Boot
• Top 50 Java Project Ideas For Beginners & Advanced
• Currency Converter
• Brick Breaker Game
• Attendance Management System
• Number Guessing Game
• Tic-Tac-Toe Game
• Simple Banking Application
• Library Management System
• Word Counter
• ATM Simulation System
• Airline Reservation System
• Smart City Project (City Guide Project)
• A Text-Based Adventure Game
• Grading System in Java
• School Management System
• Pharmacy Management System
• Supermarket Billing System
• Online Quiz Management System
• HelpDesk Management System
• Notes and Password Manager
• Supply Chain Management System
• Virtual Private Network (VPN) for an Office
• Flappy Bird Game
• Scientific Calculator in Java

Top 50 Java Project Ideas For Beginners & Advanced

Java is one of the most popular and widely used programming language and a platform that was developed by James Gosling in the year 1982. It is based on the concept of Object-oriented Programming. A platform is an environment in that develops and runs programs written in any programming language. Java is a high-level, object-oriented, secure, robust, platform-independent, multithreaded, and portable programming language.

Creating Java projects helps sharpen your skills and boosts your confidence as a developer. It provides practical application of theoretical knowledge. Building a portfolio showcasing completed projects empowers you for job interviews, giving you solutions, code, apps, and projects to display to recruiters.

With such amazing facts about Java, you would surely want to build some amazing applications using it, be it in any field like big data, mobile, enterprise, financial, or commerce. This article majorly focuses on projects which can be used by college students. Whether you’re from the first year, second year, third year, or fourth year. 

In this article, you’ll learn about some amazing Java projects starting from beginner level, intermediate to advanced level. These projects can be utilized for college assignments and will assist you in developing your Java skill set.

Table of Contents Beginner Level Java Projects Intermediate Level Java Projects Advanced Level Java Projects

Beginner Level Java Projects Ideas

The below-given list consists of some beginner-level Java project ideas which can be used as major projects by the students or professionals.

1. Currency Converter 

This project is a very basic project in Java that is used to convert a currency from one to another. A web-based interface for converting currency and getting the output value, for example, here displays converting the currency of the US dollar to INR. 

Abstract: We see variations with different countries using different currencies. Be aware of the current exchange prices in the market and then can convert from one currency to another. A calculator-like application, developed using Ajax, Applet, and web features of Java servlets. You also get a regular update when there’s a change in the value of the country’s currency and also the conversion rate. 

People use this application basically for business, shares, and finance-related areas where currency exchange and money transfer happen daily. You get a preferred choice to convert any country’s currency. Just enter the amount, the currency to which you want to transform to, click enter and you get the output.

Technologies Required: Java programming language, Java Servlets Web Features, Applet, and Ajax.

2. Brick Breaker Game

One of the pleasant ways to study technology is through implementing game applications. It may not be easy but developing this Java project will make you learn a lot of new things. This game development project will provide you with java experience and essential animation techniques with their integration. 

Abstract: Many of you already heard of the brick breaker game. It has a small ball that knocks the bricks taking the help of a small platform at the base. The player handles this platform and tries to bounce the ball through that platform. In this project, the scoring depends on the number of bricked-broken, i.e., the more you destroy the bricks, the more you score. 

If you missed the chance for the ball to bounce, then the game is over. This project is basically for beginners who are looking for a minor project. This simple project will surely help you with your first-year project or also as an implementation for fun purposes. 

Technologies Required: Java, Game development, JFrame, JPanel, and Java Graphics Kit.

3. Attendance Management System

An attendance management system is one of the major projects for university-level graduates. The project can be built using Java, the MVC architecture could be followed, and Maven as a built tool. It uses MySQL as a backend for database management and uses a tomcat server to deploy the application in order to see it working live. 

Abstract: This project is a web application that manages the attendance of any student in school or college, also employees in an organization. It has an admin feature that holds the access to do any kind of changes like update, delete, and add user records to the list. 

Various users of the application where users can access are:

Technologies Required: Java Servlet , MVC architecture, Maven MySQL , Tomcat Server JSP, HTML , CSS , and JavaScript .

4. Number Guessing Game

This number guessing game is an easy project built on Java where the player has to guess a number given in between a range. If the guessed number is right, the player wins else, loses. It also has the concept of limited attempts where the player has to guess the number within the limited attempts given. 

Abstract: The UI has an input value option where the player has to enter the guessed value, it also displays the time remaining to guess. After completing the limits given, if the guessed number is right, the player wins else loses. The range between the number can be from 1 to 100 or 1 to 1000. Also, if the number you’ve guessed is high or low to the actual value, the application sends you an alert “Too High” or “Too Low”. After the limited attempt is completed, the actual value is revealed. 

Technologies Required: Java Programming Language and Random Class in Java .

5. Tic-Tac-Toe Game

The Tic-Tac-Toe game application is a simple project developed using GUI (Graphical User Interface) in Java. It is very easy to understand and play, players generally prefer this kind of game when they’re bored and want something to play which is quick and easy.

Abstract: The game starts with two players as active members, having a one-print board on the screen which displays 9 boxes (i.e., 3×3). The first person who starts the game has to enter either X or O for any one box, followed by the other player entering the other X or O (opposite to what the first player has entered). this continues unless any one of them gets a line cut either diagonally or straight. And the person who founds the line is the winner of the game. 

Technologies Required: Java, Java Swing, Java GUI (Graphical User Interface), and JFrame.

6. Simple Banking Application

Simple Banking Application is a simple Java project for beginners to start their career in coding. You’ll learn about Scanner class to take inputs, and the basics of strings, loops, methods, and conditional statements. Here, simple banking operations like deposit, withdrawal, checking balance, exit, etc. 

Abstract: In this modernized world, where time is money, everyone has got the habit of doing their tasks online. Within a click, a task is done. You get this application to make transactions just by sitting in your comfort zone. Every operation like money transfer and balance inquiry can be done in seconds. 

Technologies Required: Java Programming Language, Oracle Database (if needed), and Java methods.

7. Library Management System 

Learning Management System, this project build on Java is a great way to update the record, monitor and add books, search for the required ones, taking care of the issue date and return date. It comes with basic features like creating a new record and updating and deleting it. 

Abstract: We rely on web-based applications for every task, be it small or big. This contains two sections – the admin and users section. The admin handles the record of the users and the user handles the entry of books being issued to him/her. Also, there can be modules that display the data of books available in the library, a search button to search for the required book, and the final payment method for the charges of the book or fine imposed. 

Technologies Required: Java, Java Swing Library, MySQL JDBC Connector, MySQL Community Server, and rs2xml.jar (used to display the data in a table format).

8. Word Counter 

A simple project for beginners is good to start. It can be built using Swing in Java. Here, the application tells you the no of words, the entered paragraph has. 

Abstract: This Java application is best suited for counting words. Remember, our childhood days when we were asked to write an essay on a given topic where the word length should be 500 or 1000. This application comes with a feature that could help you. Along with word count, it also tells you the number of characters, words, and paragraphs it has. Also, it is completely free to use and there’s no word count limit. 

Technologies Required: Java, Java Swing, Java Framework (JFrame), and Applet. 

9. ATM Simulation System

ATM simulation system is a simple Java project for beginners. It is a kind of personal banking system where users can perform various transactions like withdrawals, deposits, and checking the balance of the account in just one click. It has a Graphical User Interface (GUI) to make the process user-friendly. 

Abstract: The introduction of the application came up with two features which have an admin mode and the user mode. The admin mode is responsible for controlling the entire system like adding and deleting accounts and updating the records of the user. The user-mode takes care of the deposit, withdrawal, and checking of the account balance. The whole process of this system is automated, from PIN (Personal Identification Number) validation to the transaction. The card details will be secured enough by encrypting the details in the database and will only be accessible to the authorized user. The UI of the application contains a profile of the user, accounts added to it, and an option to withdraw, deposit and update details of the account. 

Technologies Required: Java, J2EE, Apache Tomcat Web Server, and Oracle.

10. Airline Reservation System

This Java project is built to help the customers book tickets online, check the availability of seats, get the details of the flight arrival, select the class they want to choose, and departures reserve seats for national or international flights. 

Abstract: This web-based Java project helps you in searching from pick-up location to destination, and filters out the flight details with timing, and available seats. It consolidates data from all airlines using globally distributed systems. After entering all the required details of the customer, it asks you to choose a flight with a preferred time slot, complete the payment, and book the ticket. It provides rates in real-time to customers as well as to travel agents. It also has two sections where you get to book a national and an international flight wherein you can book a domestic or international flight as per your choice. 

Technologies Required: Core Java, HTML, JavaScript, and SQL Database.

11. Smart City Project (City Guide Project)

Smart City is a web-based application built using Java. It stores details of a city and displays information about the city such as hotels, shopping marts, restaurants, tourist places, transportation modes, and also some general info. This acts as a guide to the new visitors.

Abstract: Tourists and even general people travel from one place to another in order to explore or for employment purposes but before they explore, they want to get an insight data about the place. So, to help them with this, a simple city project can be the best guide for them. It is a web-based application written in Java which basically guides you about the place you’re going to visit. You can access all the details of the city. In this application, users need to sign up by entering input details and then can access all the required details of the city. It contains various modules like admin, tourism, business, and student wherein users can switch to the module as per the requirement.  

Technologies Required: Java, JDBC ODBC 2.0 drivers, Oracle Database, J2EE, AJAX, and XML.

12. A Text-Based Adventure Game

A Text-Based Adventure game, built using Java and Data Structures is an interesting game where the player follows the commands given to him. This web-based gaming app is often referred to as interactive fiction.  

Abstract: This game has a central character called the “Adventurer” which is like an object who represents the player. With the help of the object, tracking of the actual player can be made easy, also can find where the player is. The role of the adventurer is to type the commands which consist of one or two words. The commands which have to be followed can be Go, Look, Take, Drop, Use, and Exit. It contains the following classes TextAdventure, AdventureModel, Adventurer, and a number of rooms. 

Technologies Required: Java programming language, Java objects and classes, and Array and Hashmaps.

13. Grading System in Java

This project built using Java is an important one to grade students based on their markings. It is the best project to start for beginners and has a GUI (Graphical User Interface) design. 

Abstract: The main aim to build this project is to help schools and universities to manage the details of the students (like name, class, total subjects, marks achieved, etc) and rank them on the basis of marks. It manages the calculation of the average marks achieved and ranks the student on the basis of marks. It stores the data of students in a MySQL database. The project is built on Java and has a fully GUI (Graphical User Interface). It has all the features like managing the records of students, integrating all records of examinations, displaying all the information, and keeping a track of it. 

Technologies Required: Java, Java Swing, MySQL Database, and JPanel.

14. School Management System 

The School Management System is a Java application that stores records of schools be it related to students, teachers, and staff. 

Abstract: This application’s objective is to help the school management system in managing the data easily. The manual system could be a complicated one when it comes to keeping the records so, there comes the role of this project. It holds personal records of students, teachers, and staff. This system contains modules for different roles be it admin, student, staff, and teacher. Here, the admin has to be responsible for maintaining the records in the database like adding users, updating the details of the user, and deleting the user’s profile. 

Technologies Required: Java, MS Access database, Java Swing, Java Graphical User Interface (GUI), and JFrame.

15. Pharmacy Management System

Pharmacy Management System is a web-based application built using Java that offers you the facility to order medicines, consult doctors and keep track of all your orders online by just signing up with a registered mail id. 

Abstract: This application is of great help to the users who regularly goes for body check-up because this application gives you the comfort of consulting with a doctor at your comfort place. It comes with an excellent and friendly user interface comes with an automated billing system. It has an integrated chat feature where you can consult with a doctor regarding your health and it also tells you details of medicines and you can also track the status of ordered items. 

Technologies Required: Java, Java Swing, AWT, JDBC, and MySQL Database.

16. Supermarket Billing System

This web-based application is a Java project that is usually built for keeping the sales recording made on a daily basis. It uses a MySQL database for recording the data of the users, products, and orders made by the user (customer). 

Abstract: The web-based Java application is implemented to keep a record of the products, status of the products orders, and user’s history. This UI is made in terms that it displays records of bills made on that particular day, items added to the new bill also have an automated system that calculates the bill with GST and other applied taxes and has a print button to print the copy statement of the bill. It has an admin module that is responsible for adding, updating, or deleting records of the bill. It maintains a database to store the items list, categories, and buyers list.

Technologies Required: Java, JDBC, MySQL Database, JSP, JavaScript, servlet, HTML and Ajax.

17. Online Quiz Management System

You must have definitely used this application during your school days when you were asked to attend an MCQ-based test. This Online Quiz Management System can be built using Java which contains different sections for questions, marks, and subjects.

Abstract: This Java-based project is online software that is a kind of an online platform for conducting mock tests and competitions. The UI is built in such a way that it displays the login button where the user has to sign in to begin the test, followed by entering the details of the test (which could be a unique key), then it displays the no of questions, time duration, and a “START” button to start the test. After completing the test, it asks you to review the answers and then submit it using the “SUBMIT” button. The admin module gives you access to the user’s profile. 

Technologies Required: Java, J2EE, MySQL Database, and JDBC.

18. HelpDesk Management System

HelpDesk Management System built using Java, Servlet, and MySQL is a project made with the intention to help individuals raise a complaint regarding a ticket issued to them. It uses the MVC architecture design and Servlet can manage the request and response made. 

Abstract: You face an issue, you raise a complaint, and a ticket ID is generated which can be used as a reference to resolve the issue. This application can be used in society, schools, organizations, and even in public places where people facing any kind of issues can register a complaint using the application. As soon you raise a complaint, a notification goes to the admin who verifies it and then reverts back to you after rectifying the issue. It includes features like Track, Issue, Ticket ID, Help Desk, Network, and Issues. It contains an admin and user module.

Technologies Required: Java, J2EE, HTML, JavaScript, MySQL database, Tomcat Server, JDBC, and Servlet.

19. Notes and Password Manager

This application is similar to a To-Do List app which helps you to complete your daily tasks and keep track of ongoing tasks. It also has a password for the users to log in to keep the data secure. 

Abstract: This application is of great help when individuals have a lot of tasks to perform where some of them have to be done on priority. This application keeps a track of your daily tasks and helps you in completing them. This can be used by individuals and even by organizations to manage daily tasks. This saves their time as it stores their data in a centralized database for each user. The steps to follow are setting up the details, authenticating it with an authorized user, and managing notes and passwords. It comes with basic functionalities such as a login page, home page, note page, and updating details on the note page. 

Technologies Required: Java, Android, XML, and Firebase.

20. Supply Chain Management System

Supply Chain Management System is a Java project for beginners where different operations such as inventory, storing, handling, and moving raw and finished goods to the final destination are completed. 

Abstract: This project helps enterprises to move materials from source to destination. It is generally used by the production sector where sellers can add and update the details of the goods and the buyers can contact them regarding the booking of orders. Buyers can also check the availability of the goods and keep track of the status. It uses MS Access as a back-end, Apache Tomcat as a server, and HTML and CSS to design its front-end with Java. The main objective of this application is to avoid the communication gap between dealers and clients. There’s also a feedback feature for the goods received. 

Technologies Required: Java, JDBC, JSP, HTML, and MS-Access Database

Intermediate Level Java Projects Ideas

The below-given list consists of some intermediate-level Java project ideas which can be used as major projects by the students or professionals.

21. Virtual Private Network (VPN) for an Office

Virtual Private Network (VPN) developed using Java can be your minor or major project. It works the same as WAN (Wide Area Network), and provides a private network across the public, for example, the Internet. A point-to-point virtual connection through traffic encryption, virtual tunneling protocols, or dedicated connections. 

Abstract: This application built using Java provides a secure and private connection to the organizations. It can be used on office premises, as private networks and it can also be the best means to share information. This project also has three modules which are admin and marketing where the admin’s role is to handle the data stored of the members and the training module checks for the testing and networking part, and the marketing. 

Technologies Required: Java, Java Servlet, J2EE, Apache Tomcat Server, HTML, and JavaScript.

22. Flappy Bird Game

Flappy bird game is a very simple Java-based gaming app in which the main character (which is the bird) has to reach the final destination after crossing all the hurdles. The use of the swing component in Java is perfect in this case.

Abstract: In this gaming application, the player has to control the movement of the bird. The fabby bird only ascends when there’s a tap by the player and descends the rest of the time. The count increase by 1 when the fabby bird passes one hurdle, also the time duration is counted. There shouldn’t be a collision with any hurdle, or else the game ends. 

Technologies Required: Java, Java Swing, Java AWT, and OOPS.

23. Scientific Calculator in Java

A Scientific calculator built using Java is a general-purpose application whose primary objective is to perform basic mathematical operations and also perform some essential and tricky solutions to trigonometric functions, logarithms, etc. 

Abstract: Here, Java Swing can be used to implement this project. It performs mathematical operations like addition, subtraction, multiplication, division, trigonometric operations, finding log values, etc. You get buttons to enter the input value and give the output within a second. In the program’s code, the use of switch cases can be seen to perform operations as per the case. The Scanner class can be used to take input from java.util package. 

24. Simple Search Engine

You search for anything using a search engine so building a simple search engine can be one of the best projects. Applying a ranking algorithm can give better results.

Abstract: Simple Search Engine is a Java application developed using Servlets, SQL Server, and Oracle database.  It can include features like a search bar, which displays the top 30 websites related to the keyword searched. The database containing resource description is described in SOIF (Summary Object Interchange Format) format. The interaction with the search server to access the database is dependent on the Java interface provided by classes in Java SDK. Your search engine contains a history of the pages you searched for, pages visited in the past few days, accounts linked with it, etc. 

Technologies Required: Java, Java Servlet, Oracle or SQL Database, JDBC, Apache Tomcat, and JSP.

25. Online Voting System

An online Voting System built using JSP and Servlet can be the best project for college students. This project is designed to automate the voting process where multiple parties are added and then with the maximum votes, a leader is chosen. 

Abstract: The main objective to build this web-based application is to reduce the time at the voting booth. The UI has different sections which display a login page to enter the portal, different parties with their symbol, an option to choose among them, and then to submit the entry. It uses HTML, CSS, and bootstrap in the front-end, MySQL is the database used, and also it uses an MVC design pattern. The user has to vote for the preferred party anonymously, but the voter’s information and total votes will be stored in the database. 

Technologies Required: Java, JSP, HTML, CSS, MySQL, and Tomcat Apache Server.

26. Online Book Store 

Online Book Store is an application that displays lists of books available in the store where you can purchase or even return them. You can check for the value of the book and buy it by sitting in your comfort place. 

Abstract: The application created using Java allows users to purchase a book by checking for the availability of the book. The user has to sign up, check for the book, enter the credit card details, complete the payment and order the book. There are two modules in this application – the admin and the user. The admin is responsible for the entry of details and the user makes orders. Also, you can see the categories of the book such as Software, History, English, Science, etc. All the CRUD operations are performed by the admin.

Technologies Required: Java, HTML, CSS, JavaScript, Java Servlet, MySQL, and Tomcat server.  

27. CGPA Calculator in Java

This CGPA Calculator built using Java is a web-based application that is of great help to university students. It can be built as a major project during your college days. 

Abstract: This project can be built on eclipse using Maven and uses MVC architecture. It uses MySQL to store the data. This application creates a mark sheet for students and then calculates the CGPA. Here, also the admin is held responsible for entering the details, managing the user details, etc. In the UI, you can view a search key to enter the enrollment number and you get the details displayed in seconds. All the marks for the subjects are given semester-wise. When marks of all the subjects are entered, calculated CGPA will be auto-generated. 

Technologies Required: Java, HTML, CSS, JavaScript, JSP, Java Servlet, MVC, Maven, MySQL, and Tomcat server.

28. Snake Game in Java

Remember, those days when you used to play the snake game on Nokia mobile phones. This snake game can be implemented fully using Java and uses a database using MySQL. It has all the functionalities with a full-featured Graphical User Interface (GUI). 

Abstract: The application was built long years back and gained a lot of popularity within a few months. The game starts with a snake whose size increases with the no of apples eaten by it and the life of the snake ends when it gets collided with a wall or any kind of hurdle which comes in the way. So, basically, the more apple snake eats, the more score you get. The navigation is like a snake can turn left or right by ninety degrees. A constructor can be used to start the movement of a snake and a function to perform various other operations. 

Technologies Required: Java, MySQL Database, JDBC, Java AWT, J-Frame, and Java Swing.

29. Job Portal in Java 

One thing which comes to your mind when you complete your graduation is getting a job. So, building a job portal for individuals where after entering the qualifications, the user gets the opportunity to enroll himself/herself for the job preferred. 

Abstract: The main objective of the online job portal project in java is to make the right job available for the right candidate. The admin, the recruiter, and the user are the three most vital parts of this application. Here, as soon as you enter the details or qualifications pursued by you, the recruiter verifies it and takes the further procedure ahead. The process includes verifying the details, contacting the concerned person, having all the interviews done, and receiving an offer letter. The database (which can be MongoDB) stores the data of the user. The user performs CRUD operations and deletes the profile as soon as the user gets a job. 

Technologies Required: Java, HTML, CSS, JavaScript, JSP, Java Servlet, MySQL Database, and Tomcat server.

30. Online Cab Booking System 

Ola and Uber are the online cab booking system that almost every one of us has become used. So building such a Java application would be the best idea. 

Abstract: In this project, the main objective is to help customers in booking a cab to reach their destination with pick-up as their preferred location. The application fetches your pick-up location and asks you to enter the drop location, when entered, finds a cab driver nearby and even tells you the calculated time the cab will take to drop you at the location. The system is designed using Spring MVC, Servlets, Hibernate, JDBC, JSP, HTML, and CSS. 

Technologies Required: Java, HTML, CSS, JavaScript, JSP, JDBC, Java Spring, Java Servlet, MySQL, and Tomcat Server.

31. Crime Records Management System

Based on the number of crimes being committed, this crime record management system is a secured application built using Java. It allows you to keep a record of the entries made of the number of crimes being committed. 

Abstract: This Java-based web application runs on a Tomcat server and uses MySQL as a database. Its main features include managing crimes, Handling FIRs, records of criminals, and complaints registered. You can develop a secured application using EJB, Spring, and Hibernate. You need MySQL database to run this project and MySQL J-Connector to make connections between MySQL and Java. 

Technologies Required: Java, JSP, JDBC, MySQL, and Tomcat Server.

32. Color Hunt Gaming Project

This Java-based gaming application is a mind game consisting of differently-colored letters which are randomly arranged. It is a kind of mind game that is built with the intention to increase your thought process. 

Abstract: Basically, in this game, there are different colors printed on the text, whatever statement gets displayed, you have to click on the mentioned color. As soon as you click on one, the other comes suddenly. You lose points when you don’t click on the color displayed. There’s also a time limit given in which you have to reach a given number of points. This game is built in such a way that it can only be played on android phones.  

Technologies Required: Java, Android, and XML.

33. Online CV/Resume Builder

You’re ready to apply for a job but don’t have an interesting CV/which perfectly shows your skills and qualifications. Online CV/Resume Builder comes to the rescue where just by entering required details you’ll get your CV/Resume in pdf format which is auto-generated. 

An online resume builder project is an internet-based application that can help students and other professionals to get an instant resume template, which they can fill easily with their credentials. An online resume builder provides different standard templates that can be downloaded in different formats like PDF and others. A user will not have to spend a lot of time on formatting and designing his or her resume. He will only enter his particulars and download his CV on the go.

Abstract: The online resume/cv builder application helps job seekers to build a CV with a proper format. It has different templates to choose from wherein you can opt for the best one. This application contains various modules which are user, skills, job, salary, and resume. Using these modules, different sections of a CV are made and after entering the details you get a properly organized CV.

Technologies Required: Java, MySQL Database, JDBC, Java Servlet, JSP, and Tomcat Server.

34. Weather Information System

This application tells you the weather-related information about your location and also of other locations. This Java-based application can be the best project for your minor project submission.

Abstract: Due to the change in weather, we can predict whether it’s going to be a rainy day, sunny day, or cold day. But sometimes, all of a sudden you see climate change. With the help of a weather information system which is a Java-based project, you can get to know the temperature not only your but also worldwide. The application picks up the default location and displays the weather data report. It tells you the temperature, rain, humidity, and even the direction of the wind blowing. 

Technologies Required: Java, Java Servlet, J2EE, Tomcat Server, HTML, CSS, and JavaScript.

35. Exam Seating Arrangement System

Exam Seating Arrangement System, the application implemented using JSP, Java, and MySQL. This application will help the examination handling manager to organize the allocation of seats for all the students. 

Abstract: This application takes in the details of the students be it name, roll no, section, branch, or year and stores it in databases. The admin is held responsible for managing the details, here the application is made to automate the seats allocates to students and this final list goes out on the day of examination which helps in not getting the seats revealed prior. The modules existing here are the student module, admin module, and seat module. This automated system helps in maintaining the record and proper functioning of the system.

Technologies Required: Java, HTML, CSS, JSP, JavaScript, MySQL, and Tomcat Server.

36. Traffic Controller System

The Traffic Controller System is a Java JSP and MySQL-based project, which is developed for process automation of the Traffic Controller System.

Abstract: The objective of this application is to create a system that controls the traffic which is done by implementing a set of classes and interfaces. The main features can be traffic lights, routes, diversions, and traffic police. It is a secured application that runs in the JVM. A GUI is created using JavaFX and classes for performing different operations such as the structure of the traffic network, and the main view of the system. The simulation is carried out to handle input and events that are being executed. 

37. Disaster Management System

Disaster Management System is a Java-based application that identifies and implements techniques for reducing the causes of the disaster and the losses faced. It can be the best project to avoid natural disasters. 

Abstract: Applications like this have four stages: mitigation, readiness, response, and recovery. Each process aims to reduce the risks occurred due to natural disasters like earthquakes, tsunamis, etc. The process follows when there’s a report submitted by the affected region, the data is collected and reported to the concerned authority to take measures. It is a web-based Java Swing project which stores data in MySQL for future references. The UI can have a login page, lists of earthquakes that happened, a new user page, and a user list. 

Memory Game – Flipping Tiles

Technologies Required: Java, Java Swing, JSP, JDBC, MySQL, and Java Servlet.

38. I-D Card Generator System

ID Card Generator System is a web-based Java project which uses the Swing library. It generates an ID of the entered details of the individuals and gives you a copy of it. 

Abstract: Application like this can be used in schools and offices where you require an ID card to enter the premises. In this project, you just need to log in and enter your personal details like name, age, blood group, designation, and the joining date, when you enter the required details, you get a copy of the ID card. The features can be storing the data in the database, having a unique identification number assigned to each individual, and no forgery allowed. 

Technologies Required: Java, Java Servlet, Java Swing, JSP, HTML, CSS, JavaScript, JDBC, MySQL, and Tomcat Server.

39. Memory Game – Flipping Tiles

Memory Game is a mind game where you have to remember the position of tiles placed earlier and re-assign them within the stipulated time. This game is implemented to play with your mind and bring the best.

Abstract: This Java-based gaming application is built using Swing. This game’s intention is to test our memory, here, we see an even number of tiles in which each number has a pair. All the tiles are kept facing downwards, all the tiles have to be flipped one by one, and when two tiles get matched they are removed from the tile. When there’s no match, the tiles are kept back in position. 

Technologies Required: Java, Java Swing, Java OOPS, and ArrayLists in Java.

40. Chat Application

Chat application has gained great popularity among individuals these days. This is similar to Instagram, Facebook, and Orkut. 

Abstract: This online chat application using Java uses graphical components in the Swing toolkit in Java and uses MySQL as a database. Its features include signing up, signing in, chatting, sending and accepting requests, and creating groups. You can also create a free account. It also checks whether there’s any fake account and gives no access to the user. 

Technologies Required: Java, Java Swing toolkit, MySQL, Java AWT, and JDBC. 

Advanced Level Java Projects Ideas

The below-given list consists of some advanced-level Java project ideas which can be used as major projects by the students or professionals.

41. Social Networking Site

Social Networking Site has gained a lot of popularity among individuals. It is Java JSP and MySQL project, running on the tomcat server. The management of users, photos, and videos are taken care of by this system. 

Abstract: The application has many features including a login page, a home page displaying all the posts by friends added to your account, a notification page displaying all the alerts, and a profile page where you can edit the details, and also upload a picture of yours. It uses HTTP requests to complete the operation which is being sent to the server. The process that the server follows is decoding the request, authenticating the user, and making changes to the database. JSON is used here to encode the result if found anything other than boolean.

Technologies Required: Java, Maven, J2EE, HTML, CSS, Java Servlet, JDBC, MySQL, and Tomcat Server.

42. Bug Tracking System

A system that keeps track of bugs that occurred during the development of a project. This Java-based application is created to help developers to manage bugs/errors occurring during SDLC. 

Abstract: Bug Tracking System is an application that focuses majorly on tracking the bug and changing its status. When the developer gets the help of a bug tracking system, he/she gets an assistant to help him/her during SDLC. The modules present in this can be the developer, admin, and management modules. The system records all the bugs in their detail so that the developer can work on them one by one. 

Technologies Required: Java, JDBC, JNDI, Servlets, JSP, Oracle/Access, RetHat JBoss AS, JavaScript, HTML, and CSS.

43. Text Editor in Java

Text Editor built using Java is similar to a notepad application. You can also create text documents and the system gives you the feature to edit the text entered in it. 

Abstract: A Text Editor built using Java uses JTextArea, JMenu, JMenuItems, and JMenuBar to perform various tasks. It allows the user to enter, change, store, and print text. It also has a file menu to make changes in files (like open, save, close, and print) for future references. and an edit menu to cut, copy and paste texts. Also, it has a “Save and Submit” button to close the file after saving the data. An actionListener is also used to detect actions in the project. 

Technologies Required: Java, Java Swing, Java AWT, JTextArea, JMenuBar, JMenu, and JMenuItems.

44. Digital Steganography

Security is a major concern be it in organizations, military, hospitals, schools, etc where data plays an important role. Keeping the data secure is much needed and here is a Java-based project for advanced programmers which is digital steganography. 

Abstract: Digital Steganography is the process in which data is sent from one point to another without affecting other users and also keeps the data secure. It uses multimedia as a covering medium. It embeds the text or image and stores it in the least significant bits of the image. It doesn’t even create suspense for the hackers. This is the best project advanced programmers on Java can work on. It contains both sender and receiver side programs to let the user choose whether to send or receive data. 

Technologies Required: Java, Java Servlet, MySQL or Oracle Database, JDBC, TomCat Server, JSP, HTML, CSS, and JavaScript.

45. Criminal Face Detection System

The Criminal Face Detection System application is built to detect the faces of criminals by matching them with the pre-existing data in the database. Although, there are so many ways to identify a criminal this could be the best way, and also building this project for advanced programmers is easy.

Abstract: The project is intended to use the images previously taken and identification will be done according to images taken of different people. This project aims to build an automated CFD system by levering the human ability to recall minute details in the facia. The criminal Face Detection System project aims to build a Criminal Face Detection system by levering the human ability to recall minute facial details. Identification of criminals at the scene of a crime can be achieved in many ways like fingerprinting, DNA matching, or eyewitness accounts. Out of these methods, eyewitness accounts are preferred because it stands scrutiny in court and it is a cost-effective method. It is possible that witnesses to a crime have seen the criminal though in most cases it may not be possible to completely see the face of the perpetrator.

Tip: We can also get this project done in Python language even better because of help of existing present libraries out there namely numpy and other tools: Keras. It will be easier to do in python language but doing via java makes one crystal clear about networking, machine mearning and java aplllciation onboard running concepts clear.  

Technologies Required: TensorFlow, Core java, Machine learning, SQlite, OpenCV(eccentric tool), Strong knowledge of advanced java concepts.

46. Airline Reservation System with Advanced Features

With the increase in modernization, everything has come online. This application helps customers book flight tickets by just being at their comfort place and also searching for the availability, and timing of the flight. 

Abstract: To ease and automate the registration process system provides information like passengers information and a criminal list of all passengers. The software consists of 4 modules: User registration, login, reservation, and cancelation. The project includes online transaction fares, inventory, and e-ticket operations. Do remember not to mix it with Library Management System as here we have to go to and perform something where here it is a process. Yes, it seems easy on the skills side as mentioned below which are required.

Prerequisites Required: By far we are aware of Applets, Servers, Servlets, AWT, and Core Java concepts already with Collection Framework. 

Technologies Required- Core Java, Java Swing, Java AWT, Java Applet, Database-MySQL    

47. Advanced Chatting Application 

When everything has come online, chatting is also performed online be it your online friends or anyone. Hence, this advanced chatting application has advanced features like smooth communication with video and audio call facilities, and many more.

Abstract: There is not only one system rather we dop have multiple systems connected together. Client and Server communication takes place instead of basic request-based communication. This application will need to communicate through Sockets . The server and client can run on different computers in the same network. There can be multiple clients connected to a server and they can chat with each other. These days with every application, we are having a feature ‘Help’ to chat with a bot right from traveling apps such as Ola, and Uber to food apps such as Zomato, and Swiggy, this chatbox is embedded in every.   

Sockets are something new that one has to learn here in adhering to the advancement of the project because they will be used for networking, and TCP/IP protocols so communication can be built.  

Technologies Required: Core Java, Java Network-based libraries, Java Sockets, File handling, and Exception Handling.

48. Customer-Relationship Manager 

It is a bit tedious but an easy pick among advanced-level java projects. It is also one of the most important projects as CRN is used by nearly all organizations, institutions,s or any software company as well to keep updated with the records. Do not confuse it with working just with awt and core java, as here we need to fetch it over a larger dataset in real-time for which we need to inculcate tools like Hibernate, MVC, CSS, JDBC, etc. Do create in a high-tech way invoking the above tools so that internal working of such tools can be perceived.

Abstract: It is the easiest of all projects at the advanced level as the name suggests that we have to build an application where we will be building relationships with customers by adding new customers in software, editing, and deleting the info whenever needed. The customer relations manager will keep track of all the customers. Adding new customers, editing their information, and deleting them when needed. Fetching already recorded customer details whenever required. 

Technologies Required: Spring Framework, Hibernate, HTML, CSS, JDBC, CRUD, MVC, and DB(MySQL) 

49. Email System

A great medium to conversate in an official way is through e-mails. Email system implemented using Java is of great value to organizations. So, advanced programmers can focus on the implementation of this project 

The project functions something like this – the ISP’s (Internet Service Provider) mail server handles the emails sent from an ISP. All the sent emails first come to the mail server, after which they are processed and forwarded to the collector’s destination where another mail server is located.

The mail server on the collector side receives the incoming emails and sorts them electronically in the inbox. Now, the recipient can use their email application to view the received emails. The entire transaction occurs by directly connecting to the mail server through the program, which makes it much safer than the existing email client software.

Abstract: This Email System is designed for sending and receiving emails for official communication which has a proper format. This system can use HTTP port 80 to access emails, also the two main protocols which can be used are SMTP (Simple Mail Transfer Protocol) and POP3. Java mail API can be used to transfer data. The ISP mail server receives all the mail sent, processes it, and then forwards it to the destined address. 

It is one of good project ideas among advance level project as it is of hard nut among projects we have discussed above and it will take a lot of time to properly build it. 

Technologies Required: Event Handler, HTTP, Protocols (like SMTP and POP3), 

50.  Advance Sudoku Game 

Sudoku Game is something which almost every one of us must have played. This game is all related to logic-building so once you play this, it gets easy for you to build logic so building this application is of great use.

Abstract: Building the same common sudoku game but with help of JavaFX. Generating a new game from a solution, keeping track of user input. Checking user input against the generated solution. Keeping track of selected numbers will be necessary for some of the functions and also the ability to check for errors and give hints in which we can invoke trained models from larger datasets from machine learning and artificial intelligence.    

Technologies Required: Core Java , Java FX , Event Listeners , MVC, Collection API

FAQs on Java Projects

Q.1 why use java.

Java is simple to learn programming language because doesn’t contain concepts like : Pointers and operator overloading and it is secure and portable.

Q.2 What is the difference between C++ and Java?

C++ JAVA C++ is platform dependent. Java is platform-independent. C++ uses a compiler only. Java uses a compiler and interpreter both. C++ support pointers and operator overloading. Java doesn’t support pointers and operator overloading concepts. C++ does not support the multithreading concept. Java supports the multithreading concept.

Q3: What are some good Java projects for beginners?

Here are the top 5 Java projects for beginners: Simple Calculator : Create a basic calculator application that performs arithmetic operations such as addition, subtraction, multiplication, and division. Address Book : Build an address book application that allows users to add, view, update, and delete contact information. Tic-Tac-Toe Game : Develop a simple console-based tic-tac-toe game where two players can take turns marking their moves on a grid. Hangman Game : Implement a text-based hangman game where players guess letters to reveal a hidden word. Temperature Converter: Design a program that converts temperatures between Fahrenheit, Celsius, and Kelvin scales. These projects are beginner-friendly and provide a solid foundation in Java programming concepts.

Q4: What kind of projects is Java used for?

Java is used for a wide range of projects, including web development, Android app development, enterprise software, big data processing, scientific computing, and financial applications.

Q5: Is Java worth learning in 2023?

Yes, learning Java in 2023 is highly beneficial due to its wide usage in enterprise applications, Android development, and strong community support. Java remains a valuable skill with abundant job opportunities and a versatile ecosystem.

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Develop Kubernetes Operators in Java without Breaking a Sweat

Alex Stockinger

Developing Kubernetes operators in Java is not yet the norm. So far, Go has been the language of choice here, not least because of its excellent support for writing corresponding tests. 

One challenge in developing Java-based projects has been the lack of easy automated integration testing that interacts with a Kubernetes API server. However, thanks to the open source library Kindcontainer , based on the widely used Testcontainers integration test library, this gap can be bridged, enabling easier development of Java-based Kubernetes projects. 

In this article, we’ll show how to use Testcontainers to test custom Kubernetes controllers and operators implemented in Java.

Kubernetes in Docker

Testcontainers allows starting arbitrary infrastructure components and processes running in Docker containers from tests running within a Java virtual machine (JVM). The framework takes care of binding the lifecycle and cleanup of Docker containers to the test execution. Even if the JVM is terminated abruptly during debugging, for example, it ensures that the started Docker containers are also stopped and removed. In addition to a generic class for any Docker image, Testcontainers offers specialized implementations in the form of subclasses — for components with sophisticated configuration options, for example. 

These specialized implementations can also be provided by third-party libraries. The open source project Kindcontainer is one such third-party library that provides specialized implementations for various Kubernetes containers based on Testcontainers:

• ApiServerContainer
• K3sContainer
• KindContainer

Although ApiServerContainer focuses on providing only a small part of the Kubernetes control plane, namely the Kubernetes API server, K3sContainer and KindContainer launch complete single-node Kubernetes clusters in Docker containers. 

This allows for a trade-off depending on the requirements of the respective tests: If only interaction with the API server is necessary for testing, then the significantly faster-starting ApiServerContainer is usually sufficient. However, if testing complex interactions with other components of the Kubernetes control plane or even other operators is in the scope, then the two “larger” implementations provide the necessary tools for that — albeit at the expense of startup time. For perspective, depending on the hardware configuration, startup times can reach a minute or more.

A first example

To illustrate how straightforward testing against a Kubernetes container can be, let’s look at an example using JUnit 5:

Thanks to the @Testcontainers JUnit 5 extension, lifecycle management of the ApiServerContainer is easily handled by marking the container that should be managed with the @Container annotation. Once the container is started, a YAML document containing the necessary details to establish a connection with the API server can be retrieved via the getKubeconfig() method. 

This YAML document represents the standard way of presenting connection information in the Kubernetes world. The fabric8 Kubernetes client used in the example can be configured using Config.fromKubeconfig() . Any other Kubernetes client library will offer similar interfaces. Kindcontainer does not impose any specific requirements in this regard.

All three container implementations rely on a common API. Therefore, if it becomes clear at a later stage of development that one of the heavier implementations is necessary for a test, you can simply switch to it without any further code changes — the already implemented test code can remain unchanged.

Customizing your Testcontainers

In many situations, after the Kubernetes container has started, a lot of preparatory work needs to be done before the actual test case can begin. For an operator, for example, the API server must first be made aware of a Custom Resource Definition (CRD), or another controller must be installed via a Helm chart. What may sound complicated at first is made simple by Kindcontainer along with intuitively usable Fluent APIs for the command-line tools kubectl and helm .

The following listing shows how a CRD is first applied from the test’s classpath using kubectl , followed by the installation of a Helm chart:

Kindcontainer ensures that all commands are executed before the first test starts. If there are dependencies between the commands, they can be easily resolved; Kindcontainer guarantees that they are executed in the order they are specified.

The Fluent API is translated into calls to the respective command-line tools. These are executed in separate containers, which are automatically started with the necessary connection details and connected to the Kubernetes container via the Docker internal network. This approach avoids dependencies on the Kubernetes image and version conflicts regarding the available tooling within it.

Selecting your Kubernetes version

If nothing else is specified by the developer, Kindcontainer starts the latest supported Kubernetes version by default. However, this approach is generally discouraged, so the best practice would require you to explicitly specify one of the supported versions when creating the container, as shown:

Each of the three container implementations has its own Enum , through which one of the supported Kubernetes versions can be selected. The test suite of the Kindcontainer project itself ensures — with the help of an elaborate matrix-based integration test setup — that the full feature set can be easily utilized for each of these versions. This elaborate testing process is necessary because the Kubernetes ecosystem evolves rapidly, and different initialization steps need to be performed depending on the Kubernetes version.

Generally, the project places great emphasis on supporting all currently maintained Kubernetes major versions, which are released every 4 months. Older Kubernetes versions are marked as @Deprecated and eventually removed when supporting them in Kindcontainer becomes too burdensome. However, this should only happen at a time when using the respective Kubernetes version is no longer recommended.

Bring your own Docker registry

Accessing Docker images from public sources is often not straightforward, especially in corporate environments that rely on an internal Docker registry with manual or automated auditing. Kindcontainer allows developers to specify their own coordinates for the Docker images used for this purpose. However, because Kindcontainer still needs to know which Kubernetes version is being used due to potentially different initialization steps, these custom coordinates are appended to the respective Enum value:

In addition to the Kubernetes images themselves, Kindcontainer also uses several other Docker images. As already explained, command-line tools such as kubectl and helm are executed in their own containers. Appropriately, the Docker images required for these tools are configurable as well. Fortunately, no version-dependent code paths are needed for their execution. 

Therefore, the configuration shown in the following is simpler than in the case of the Kubernetes image:

The coordinates of the images for all other containers started can also be easily chosen manually. However, it is always the developer’s responsibility to ensure the use of the same or at least compatible images. For this purpose, a complete list of the Docker images used and their versions can be found in the documentation of Kindcontainer on GitHub.

Admission controller webhooks

For the test scenarios shown so far, the communication direction is clear: A Kubernetes client running in the JVM accesses the locally or remotely running Kubernetes container over the network to communicate with the API server running inside it. Docker makes this standard case incredibly straightforward: A port is opened on the Docker container for the API server, making it accessible. 

Kindcontainer automatically performs the necessary configuration steps for this process and provides suitable connection information as Kubeconfig for the respective network configuration.

However, admission controller webhooks present a technically more challenging testing scenario. For these, the API server must be able to communicate with external webhooks via HTTPS when processing manifests. In our case, these webhooks typically run in the JVM where the test logic is executed. However, they may not be easily accessible from the Docker container.

To facilitate testing of these webhooks independently of the network setup, yet still make it simple, Kindcontainer employs a trick. In addition to the Kubernetes container itself, two more containers are started. An SSH server provides the ability to establish a tunnel from the test JVM into the Kubernetes container and set up reverse port forwarding, allowing the API server to communicate back to the JVM. 

Because Kubernetes requires TLS-secured communication with webhooks, an Nginx container is also started to handle TLS termination for the webhooks. Kindcontainer manages the administration of the required certificate material for this. 

The entire setup of processes, containers, and their network communication is illustrated in Figure 1.

Fortunately, Kindcontainer hides this complexity behind an easy-to-use API:

The developer only needs to provide the port of the locally running webhook along with some necessary information for setting up in Kubernetes. Kindcontainer then automatically handles the configuration of SSH tunneling, TLS termination, and Kubernetes.

Consider Java

Starting from the simple example of a minimal JUnit test, we have shown how to test custom Kubernetes controllers and operators implemented in Java. We have explained how to use familiar command-line tools from the ecosystem with the help of Fluent APIs and how to easily execute integration tests even in restricted network environments. Finally, we have shown how even the technically challenging use case of testing admission controller webhooks can be implemented simply and conveniently with Kindcontainer. 

Thanks to these new testing possibilities, we hope more developers will consider Java as the language of choice for their Kubernetes-related projects in the future.

• Visit the Testcontainers website .
• Get started with Testcontainers Cloud by creating a free account .
• Get the latest release of Docker Desktop .
• Vote on what’s next! Check out our public roadmap .
• Have questions? The Docker community is here to help .
• New to Docker? Get started .
• Subscribe to the Docker Newsletter .

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Build Your Own AI-Driven Code Analysis Chatbot for Developers with the GenAI Stack

Docker announces soc 2 type 2 attestation & iso 27001 certification, highlights from microsoft build: docker's innovations with ai and windows on arm.

Jun 6, 2024

• Engineering

• Java RMI Tutorial
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Java RMI - Introduction

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• Java RMI - Discussion
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• Computer Glossary

RMI stands for Remote Method Invocation . It is a mechanism that allows an object residing in one system (JVM) to access/invoke an object running on another JVM.

RMI is used to build distributed applications; it provides remote communication between Java programs. It is provided in the package java.rmi .

Architecture of an RMI Application

In an RMI application, we write two programs, a server program (resides on the server) and a client program (resides on the client).

Inside the server program, a remote object is created and reference of that object is made available for the client (using the registry).

The client program requests the remote objects on the server and tries to invoke its methods.

The following diagram shows the architecture of an RMI application.

Let us now discuss the components of this architecture.

Transport Layer − This layer connects the client and the server. It manages the existing connection and also sets up new connections.

Stub − A stub is a representation (proxy) of the remote object at client. It resides in the client system; it acts as a gateway for the client program.

Skeleton − This is the object which resides on the server side. stub communicates with this skeleton to pass request to the remote object.

RRL(Remote Reference Layer) − It is the layer which manages the references made by the client to the remote object.

Working of an RMI Application

The following points summarize how an RMI application works −

When the client makes a call to the remote object, it is received by the stub which eventually passes this request to the RRL.

When the client-side RRL receives the request, it invokes a method called invoke() of the object remoteRef . It passes the request to the RRL on the server side.

The RRL on the server side passes the request to the Skeleton (proxy on the server) which finally invokes the required object on the server.

The result is passed all the way back to the client.

Marshalling and Unmarshalling

Whenever a client invokes a method that accepts parameters on a remote object, the parameters are bundled into a message before being sent over the network. These parameters may be of primitive type or objects. In case of primitive type, the parameters are put together and a header is attached to it. In case the parameters are objects, then they are serialized. This process is known as marshalling .

At the server side, the packed parameters are unbundled and then the required method is invoked. This process is known as unmarshalling .

RMI Registry

RMI registry is a namespace on which all server objects are placed. Each time the server creates an object, it registers this object with the RMIregistry (using bind() or reBind() methods). These are registered using a unique name known as bind name .

To invoke a remote object, the client needs a reference of that object. At that time, the client fetches the object from the registry using its bind name (using lookup() method).

The following illustration explains the entire process −

Goals of RMI

Following are the goals of RMI −

• To minimize the complexity of the application.
• To preserve type safety.
• Distributed garbage collection.
• Minimize the difference between working with local and remote objects.

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Kotlin vs Java for Mobile and Web Development

When starting a new project, choosing a programming language is one of the most critical things to consider. Your choice plays a vital role in your application’s efficiency, scalability, maintenance, and overall performance.

Two languages that stand out in web and mobile development are Kotlin  and Java . They’re widely used, versatile, robust, object-oriented languages that can serve as a solid foundation for your development needs.

This article highlights the similarities and differences between Kotlin and Java, their benefits and limitations, and some use cases to help you decide which language to choose for your projects.

What Is Java?

Java  is a high-level, object-oriented programming language (OOP). In other words, everything in Java is organized by classes and objects. It’s also platform-independent, meaning you can write your code once and run it on any platform with a Java Virtual Machine (JVM).

Its ability to handle large-scale workloads has made Java a reliable choice for web and application development. Many organizations, including Google, Uber, and Airbnb , use Java in their tech stacks.

Java boasts a prominent and engaging developer community that provides open-source projects and learning resources. By working with Java, you can access a broad selection of libraries, frameworks, and other tools the community maintains.

What Is Kotlin?

Kotlin  is an open-source, modern, statically typed programming language initially designed to be compatible with a JVM. However, Kotlin has expanded its capabilities to support other environments, such as web browsers. It also embraces both functional and OOP concepts.

Kotlin addresses Java’s limitations, making it a more concise, expressive, and safe language. Kotlin is also interoperable with Java so you can use it with existing Java code and libraries.

In 2017, Google announced Kotlin as the official language  for Android development, leading to the widespread adoption of Kotlin among Android developers.

A critical feature Kotlin provides is Kotlin/JS, which allows you to compile Kotlin code into JavaScript . This feature enables you to combine the unique features of Kotlin with popular JavaScript libraries  for web development.

Kotlin and Java Compared

Now that you have a high-level overview of the two languages, this section looks at how Kotlin and Java differ from each other and their similarities.

Syntax and Language

Java is verbose. Since it doesn’t support type inference, you must indicate the data and return types of variables and methods. Additionally, Java code often resides in classes, leading to more boilerplate code.

The snippet below shows the lines of code needed to create a simple “Hello, world” program in Java:

Kotlin, on the other hand, is more concise. It eliminates much of the boilerplate present in Java by introducing features such as type inference, smart casts, data classes, and null safety.

The following snippet is the equivalent of the “Hello, world” program in Kotlin and demonstrates its concision compared to Java:

In Kotlin, variables are non-nullable by default unless you explicitly mark them as nullable using the ?  operator. By contrast, if you can assign null  to any variable in Java, it makes it prone to null pointer exceptions.

Kotlin and Java handle concurrency differently. While Java provides Thread  and Executor  for concurrent tasks, Kotlin uses coroutines and suspending functions, allowing you to perform asynchronous tasks sequentially.

It’s also worth noting that, unlike Java, semicolons are optional in Kotlin. Kotlin also provides other distinctive features, such as sealed classes, singletons, inline functions, and functional programming.

Performance and Efficiency

Kotlin generally compiles into the same JVM bytecode as Java, so the difference in performance between both languages in production applications is usually negligible. However, Kotlin slightly outperforms Java in some areas due to its more concise syntax and modern features, such as inline functions.

Interoperability and Compatibility

As Java has a mature ecosystem of libraries and frameworks, it supports different databases, including Oracle, MySQL , and PostgreSQL . It also provides several frameworks for web development, like Spring , Jakarta Server Pages, formerly JavaServer Pages (JSP) , and Jakarta Faces, formerly Jakarta Server Faces and JavaServer Faces (JSF) .

Kotlin, on the other hand, is entirely interoperable with Java allowing you to call Java code from Kotlin  and vice-versa . Consequently, you can integrate the abundant collection of Java libraries in your Kotlin projects.

Similarly, with Kotlin/JS, you can leverage various JavaScript frameworks and libraries , such as React.js  and Vue.js  for web development.

Use Cases for Kotlin and Java

You can use Kotlin and Java for a wide range of web and app development projects, as outlined in the following sections.

Java Use Cases

Java is a great option for the following use cases:

• Legacy codebases — Developers often use Java to maintain legacy codebases, particularly enterprise and legacy Android applications.
• Projects dependent on Java frameworks  — Java has extensive libraries and frameworks that cut across different domains. You can integrate existing Java libraries to simplify development tasks.
• Web development  — Java offers several frameworks well-suited for web development, including JSF, JSP, and Spring.
• Teams with extensive Java experience  — Experienced teams can leverage their knowledge of Java to deliver high-quality applications quickly.

Kotlin Use Cases

The following use cases can benefit from using Kotlin:

• New Android projects  — Since Kotlin is the official recommended language for Android development, newer Android libraries like Jetpack Compose  are only available there. So, consider using Kotlin for your new Android projects.
• Web development : With Kotlin/JS, you can use Kotlin for your frontend  web development projects and frameworks like Ktor  and Spring for your backend development needs.
• Concise and readable code — Kotlin is best suited for projects prioritizing clean, concise, and readable code due to its expressive syntax.
• Use of modern language features  — When developer productivity is a priority, Kotlin’s coding features, such as sound null safety, type inference, and data classes, make it your best choice.

Kotlin and Java in the Android and Web Ecosystem

Google’s first-class support of Kotlin for Android development has driven its widespread adoption. However, most of the Android SDK  supports libraries and legacy applications that are still in Java so that you can use both languages in the same codebase for Android development.

More developers and organizations are embracing Kotlin with Ktor and Kotlin/JS for web development. Nonetheless, Java still has the upper hand in this area thanks to its extensive, stable, and mature ecosystem of libraries and frameworks tailored for web development.

How To Pick the Right Language: Kotlin or Java

Although Kotlin and Java share several similarities, they address different problems and have different strengths.

Choosing the most appropriate language is dependent on various factors, including:

• Project requirements — Evaluating your project’s needs helps you determine which language aligns the best with your project’s goals. For example, consider the target platform of your application. Java may be better suited for enterprise server applications, whereas Kotlin might be the better choice for applications aimed at the Android OS.
• Team skill set — Your team’s expertise is essential to consider. If your team is already experienced with Java, using Java might be a more prudent option as they can leverage this knowledge instead of learning a new language and syntax.
• Language features — Assessing each language’s features helps you understand which language aligns better with your development needs. For instance, Kotlin supports null safety, which minimizes the risk of runtime errors, unlike Java, which is prone to null-related exceptions.
• Language establishment and stability — Considering the level of establishment and stability of each language is vital, as these factors can significantly impact the success and longevity of your project. Java, with its decades-long history and proven reliability, is a solid choice for projects that demand a dependable platform. Kotlin, while innovative and agile, may introduce more frequent changes, making Java the preferred option for projects requiring long-term stability and reliable performance.

Both Kotlin and Java are good choices for web and application development. Java has excellent community support and many community-maintained libraries. However, Java is verbose and doesn’t support modern language features like null safety. Comparatively, Kotlin is much more concise, interoperable with Java, and has a steadily growing community.

Also, while Java has primitive types, which you must explicitly define for variables and methods, Kotlin treats them as objects and can infer data types. Kotlin also provides different syntactic sugar, such as data classes, extension functions, smart casts, and operator overloading, making code expressive and maintainable.

Ultimately, choosing which language to use depends on your project requirements, your team’s experience, and the language with the features that align best with your project’s goals. You can experiment with both languages to determine which one suits your needs.

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I'm the Editorial Team Lead at Kinsta. I'm a open source enthusiast and I love coding. With more than 7 years of technical writing and editing for the tech industry, I love collaborating with people to create clear and concise pieces of content and improve workflows.

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