java ppt presentation

Chapter 01: �Introduction to Java

Lecturer: Mr. Sam Vanthath

• To understand the relationship between Java and World Wide Web.
• To know Java’s advantages.
• To distinguish the terms API, IDE and JDK.
• To write a simple Java program.
• To create, compile and run Java programs.
• To know the basic syntax of a Java program.
• To display output on the console and on the dialog box.

1. Java, World Wide Web, and Beyond

2. Characteristics of Java

3. The Java Language Specification, API, JDK, and IDE

4. A Simple Java Program

5. Creating, Compiling, and Executing a Java Program

6. Anatomy of the Java Program

• How to write Java application
• Input and Output statements

1. Java, World Wide Web, and Beyond (P. 13)

• Today Java is used for:
• Web Programming
• Developing standalone applications across platforms on
• and mobile devices
• Developing the code to communicate with and control the robotic rover that rolled on Mars.

2. Characteristics of Java (P. 16)

• Java particular feature is to write a program once and run it everywhere.
• Object-oriented

Distributed

Interpreted

• Architecture-neutral
• High-performance

Multithreaded

• Easier than C++
• Replace multiple inheritance in C++ with a simple language construct called an interface
• Eliminate pointers
• Use automatic memory allocation and garbage collection
• Easy to write and read

Object-Oriented

• Replace traditional procedure programming techniques.
• OOP models the real world in terms of objects.
• Central issue in software development is how to reuse code.
• OOP provides great flexibility, modularity, clarity and reusability through encapsulation, inheritance, and polymorphism.
• Several computers working together on a network.
• Java is designed to make distributed computing easy.
• Writing network programs in Java is like sending and receiving data to and from a file.
• Unlike conventional language translators
• Compiler converts source code into a machine-independent format (Byte code)
• allow it to run on any computer H/W that has the Java runtime system (Java Virtual Machine)
• Means reliable.
• Java has a runtime exception-handling feature.
• Java forces the programmer to write the code to deal with exceptions.
• Java can catch and respond to an exceptional situation
• so the program can continue its normal execution
• and terminate gracefully when a runtime error occurs.
• As an Internet programming language, Java is used in a networked and distributed environment.
• If you download a Java applet and run it on your computer, it will not damage your system.

Architecture-Neutral

• As Java is interpreted, this feature enables Java to be architecture-neutral or platform-independent.
• Using Java, developers need to write only one version of software so it can run on every platform (Windows, OS/2, Macintosh, and various UNIX, IBM AS/400, and IBM mainframes).
• Because Java is architecture-neutral, Java programs are portable.
• They can be run on any platform without being recompiled.

Performance

• Design well to perform on very low-power CPUs
• Easy to translate directly to native machine code
• Multithreading is a program’s capability to perform several tasks simultaneously (e.g: Downloading a video file while playing the video).
• Multithreading is particularly useful in GUI programming (e.g: a user can listen to an audio recording while surfing the Web page) and network programming (e.g: A server can serve multiple clients at the same time).
• Libraries can freely add new methods and instance variables.
• New class can be loaded on the fly without recompilation.

3. The Java Language Specification, API, JDK, and IDE (P. 19)

• Computer languages have strict rules of usages.
• If you do not follow the rules when writing a program, the computer will be unable to understand it.
• Java language specification and Java API define the Java standard.

Java Language specification & API

• Java Language specification is a technical definition of the language that includes the syntax and semantics of the Java programming language.
• The application programming interface (API) contains predefined classes and interfaces for developing Java programs.
• The Java language specification is stable, but the API is still expanding.

Java API Editions

• There are 3 editions of Java API: Java 2 Standard Edition (J2SE), Java 2 Enterprise Edition (J2EE) and Java 2 Micro Edition (J2ME).
• J2SE: used to develop client-side standalone applications or applets.
• J2EE: used to develop server-side applications, such as Java servlets and JavaServer Pages.
• J2ME: used to develop applications for mobile devices, such as cell phones.

Java Development Toolkit (JDK)

• For J2SE 5.0, the Java Development Toolkit is called JDK5.0, formerly known as JDK1.5.
• JDK consists of a set of separate programs for developing and testing Java programs, each of which is invoked from a command line.
• Besides JDK, there are more than a dozen Java development tools such as JBuilder, NetBeans, Sun ONE, Eclipse, JCreator, … These tools provide an integrated development environment (IDE) for rapidly developing Java programs (Editing, compiling, building, debugging and online help).

4. A Simple Java Program (P. 20)

• There are 2 Java Programs: Java Applications and applets.
• Java Applications can be executed from any computer with a Java interpreter.
• Java applets can be run directly from a Java-compatible Web browser. Applets are suitable for deploying Web projects.

A simple java applicationcode

// This application program prints Welcome to Java!

public class Welcome {

• public static void main(String[] args){

System.out.println( "Welcome to Java!" );

Class heading

Main method signature

5. Creating, Compiling, and Executing a Java Program (P. 21)

• You have to create your program and compile it before it can be executed.
• If your program has compilation errors, you have to fix them by modifying the program then recompile it.
• If your program has runtime errors or does not produce the correct result, you have to modify the program, recompile it and execute it again.

6. Anatomy of the Java Program (P. 23)

• The previous sample code has the following components:
• Reserved words
• The main method
• Comments help programmers and users to communicate and understand the program.
• Comments are ignored by the compiler.
• A line comment: //
• A paragraph comment: /*…*/

// This application prints Welcome!

/* This application prints Welcome!*/

/* This application prints

Reserved Words

• Reserved Words or Keywords are words that have a specific meaning to the compiler and cannot be used for other purpose in the program.
• E.g: class, public, static, void are keywords
• Java uses certain reserved words called modifiers that specify the properties of the data, methods and classes and how they can be used.
• E.g: public, static, private, final, abstract and protected
• A statement represents an action or a sequence of actions.
• The statement Systemout.println(“Welcome to Java!”) in previous code is a statement to display the greeting “Welcome to Java!”.
• Every statement in Java ends with a semicolon (;).
• The braces in the program form a block that groups the components of the program.
• A block begins with ({) and ends with (}).
• Every method has a method block that groups the statements in the method.
• Blocks can be nested.

public class Test{

System.out.println(“Welcome to java!”);

Class block

Method block

• The class is the essential Java construct.
• To program in Java, you must understand classes and be able to write and use them.
• A program is defined by using one or more classes.
• Method consists of a collection of statements that perform a sequence of operations.
• E.g: System.out.println?
• System.out: the standard output object
• println: the method in the object which to displays a message to the standard output device.

The main Method

• Every Java application must have a user-declared main method that defines where the program begins.
• The Java interpreter executes the application by invoking the main method.
• The main method looks like this:
• //Statemtns;

How to write Java applications

Two types of Java Program

• Applet Program
• Program which is running on Web Browser
• Use Appletviewer or internet explorer
• Application program
• Typical application program
• Execute using interpreter named “java”

Checkpoints for the Beginner

• Java differentiates the upper- and lower- cases.
• File differentiates the upper- and lower- cases.
• Should set the environment variables correctly.
• Run the program including main()
• The format of main is always� public static void main (String args[])
• Or public static void main (String[] args)
• Applet class is always public.

Checkpoints for the Beginner (Cont.)

• One file can have only one “public” class.�– compile error.
• If there is a class declared “public”, then the file name should be same as that public class name.
• Constructor doesn’t have a return type and has the same name as the class name.
• There is no comma between width and height in the HTML file.��<applet code=class-file-name width=300 height=200>�</applet>

Rules of naming the class and method

• English Noun type
• Starts with upper-case letter
• Coming multiple nouns : not with “_” , combine with another Uppercase.
• Ex. Car, ChattingServer
• Method Name
• English Verb type
• Starts with lower-case letter
• Ex. getName(), setLabel()

Input and Output Statements

Printing a Line of Text Example (Welcome1.java)

// Welcome1.java

// Text-printing program.

public class Welcome1 {

// main method begins execution of Java application

public static void main( String args[] )

System.out.println( “Welcome to Java Programming!” );

} // end method main

} // end class Welcome1

Printing a Line of Text (Cont.)

Compiling a program

• Open a command prompt window, go to directory where program is stored
• Type javac Welcome1.java
• If no errors, Welcome1.class created
• Has bytecodes that represent application
• Bytecodes passed to Java interpreter
• Executing a program
• Type java Welcome1
• Interpreter loads .class file for class Welcome1
• .class extension omitted from command
• Interpreter calls method main

Modifying Our First Java Program

• Modify example in Welcome1.java to print same contents using different code
• Modifying programs
• Welcome2.java produces same output as Welcome1.java
• Using different code�System.out.print( "Welcome to " ); System.out.println( "Java Programming!" );
• System.out.print( "Welcome to " ) displays “Welcome to ” with cursor remaining on printed line
• System.out.println( "Java Programming!" ) displays “Java Programming!” on same line with cursor on next line

Example (Welcome2.java)

// Welcome2.java

public class Welcome2 {

System.out.print( “Welcome to ” );

System.out.println( “Java Programming!” );

} // end class Welcome2

Modifying Our First Java Program (Cont.)

Newline characters (\n)

• Interpreted as “special characters” by methods System.out.print and System.out.println
• Indicates cursor should be on next line
• Welcome3.java�System.out.println( "Welcome\nto\nJava\nProgramming!" );
• Line breaks at \n
• Can use in System.out.println or System.out.print to create new lines

System.out.println( "Welcome\nto\nJava\nProgramming!" );

Example (Welcome3.java)

// Welcome3.java

public class Welcome3 {

} // end class Welcome3

• Escape characters
• Backslash ( \ ) indicates special characters to be output

Displaying Text in a Dialog Box

• Most Java applications use windows or a dialog box
• We have used command window
• Class JOptionPane allows us to use dialog boxes
• Set of predefined classes for us to use
• Groups of related classes called packages
• Group of all packages known as Java class library or Java applications programming interface (Java API)
• JOptionPane is in the javax.swing package
• Package has classes for using Graphical User Interfaces (GUIs)

Displaying Text in a Dialog Box (Cont.)

• Upcoming program
• Application that uses dialog boxes
• Explanation will come afterwards
• Demonstrate another way to display output
• Packages, methods and GUI

Example (Welcome4.java)

// Welcome4.java

// Printing multiple lines in a dialog box.

// Java packages

import javax.swing.JOptionPane; // program uses JOptionPane

public class Welcome4 {

JOptionPane.showMessageDialog(

null , "Welcome\nto\nJava\nProgramming!" );

System.exit( 0 );

// terminate application with window

} // end class Welcome4

Another Java Application : Adding Integers

• Use input dialogs to input two values from user
• Use message dialog to display sum of the two values

Example (Addition.java)

// Addition.java

// Addition program that displays the sum of two numbers.

public class Addition {

String firstNumber; // first string entered by user

String secondNumber; // second string entered by user

int number1; // first number to add

int number2; // second number to add

int sum; // sum of number1 and number2

// read in first number from user as a String

firstNumber = JOptionPane.showInputDialog( "Enter first integer" );

// read in second number from user as a String

secondNumber =

JOptionPane.showInputDialog( "Enter second integer" );

Example (Addition.java) (Cont.)

// convert numbers from type String to type int

number1 = Integer.parseInt( firstNumber );

number2 = Integer.parseInt( secondNumber );

// add numbers

sum = number1 + number2;

// display result

JOptionPane.showMessageDialog( null , "The sum is " + sum, "Results" ,� JOptionPane.PLAIN_MESSAGE );

System.exit( 0 ); // terminate application with window

} // end class Addition

Review Questions

• What is needed to run Java on a computer?
• What are the input and output of a Java compiler?
• Explain the Java keywords. List some that you have learned.
• Is Java case-sensitive? What is the case for Java keyword?
• What is the Java source filename extension, and what is the Java bytecode filename extension?
• What is the statement to display a string on the console? What is the statement to display the message “Hello World” in a message dialog box?
• Read Chapter01 Summary (P. 28-29)
• Create a Java program that displays these text in a dialog:

I am a student at CMU.

I am practicing Java code.

“Thanks!!!”

• Create a Java program that receives 3 input from users (Name, Midterm and Final score) and display the result on a dialog box:

Student Name: xxx xxx

Midterm score: xx pt

Final score: xx pt

Total score: xx pt

Browse Course Material

Course info, instructors.

• Adam Marcus

Departments

• Electrical Engineering and Computer Science

As Taught In

• Programming Languages
• Software Design and Engineering

Learning Resource Types

Introduction to programming in java, lecture 4: classes and objects.

Lecture presentation on programming in Java. Topics include: object oriented programming, defining classes, using classes, constructors, methods, accessing fields, primitives versus references, references versus values, and static types and methods.

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Introduction to JAVA

Aug 22, 2018

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JAVA was developed by Sun Microsystems Inc in 1991, later acquired by Oracle Corporation. It was developed by James Gosling and Patrick Naughton. It is a simple programming language. Writing, compiling and debugging a program is easy in java. It helps to create modular programs and reusable code.

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Presentation Transcript

Java Introduction By Professional Guru

Introduction • Welcome to the course Object Oriented Programming in JAVA. This course will cover a core set of computer science concepts needed to create a modern software application using Java. http://professional-guru.com

Course Objectives On completion of this course we will be able to: 1. 2. 3. 4. 5. Identify the importance of Java . Identify the additional features of Java compared to C++ . Identify the difference between Compiler and Interpreter . Identify the difference between applet and application . Apply Object Oriented Principles of Encapsulations, Data abstraction, Inheritance, Polymorphism. Program using java API (Application Programming Interface). Program using Exception Handling, Files and Threads . Program Using applets and swings . 6. 7. 8. http://professional-guru.com

Course Syllabus UNIT CONCEPTS to be covered UNIT-I JAVA Basics UNIT-II Inheritance UNIT-III Data structures creation and manipulation in java UNIT-IV Exception Handling UNIT-V GUI Programming With JAVA http://professional-guru.com

JAVA Basics http://professional-guru.com

Why Java is Important • Two reasons : – Trouble with C/C++ language is that they are not portable and are not platform independent languages. – Emergence of World Wide Web, which demanded portable programs • Portability and security necessitated the invention of Java http://professional-guru.com

History • James Gosling - Sun Microsystems • Co founder – Vinod Khosla • Oak - Java, May 20, 1995, Sun World • JDK Evolutions – JDK 1.0 (January 23, 1996) – JDK 1.1 (February 19, 1997) – J2SE 1.2 (December 8, 1998) – J2SE 1.3 (May 8, 2000) – J2SE 1.4 (February 6, 2002) – J2SE 5.0 (September 30, 2004) – Java SE 6 (December 11, 2006) – Java SE 7 (July 28, 2011) http://professional-guru.com

Cont.. • Java Editions. J2SE(Java 2 Standard Edition) - to develop client-side standalone applications or applets. J2ME(Java 2 Micro Edition ) - to develop applications for mobile devices such as cell phones. J2EE(Java 2 Enterprise Edition ) - to develop server-side applications such as Java servlets and Java ServerPages. http://professional-guru.com

What is java? • A general-purpose object-oriented language. • Write Once Run Anywhere (WORA). • Designed for easy Web/Internet applications. • Widespread acceptance. http://professional-guru.com

How is Java different from C… • C Language: – Major difference is that C is a structure oriented language and Java is an object oriented language and has mechanism to define classes and objects. – Java does not support an explicit pointer type – Java does not have preprocessor, so we cant use #define, #include and #ifdef statements. – Java does not include structures, unions and enum data types. – Java does not include keywords like goto, sizeof and typedef. – Java adds labeled break and continue statements. – Java adds many features programming. required for object oriented http://professional-guru.com

How is Java different from C++… • C++ language Features removed in java: Java doesn’t support pointers to avoid unauthorized access of memory locations. Java does not include structures, unions and enum data types. Java does not support operator over loading. Preprocessor plays less important role in C++ and so eliminated entirely in java. Java does not perform automatic type conversions that result in loss of precision. http://professional-guru.com

Cont…  Java does not support global variables. Every method and variable is declared within a class and forms part of that class.  Java does not allow default arguments.  Java does not support inheritance of multiple super classes by a sub class (i.e., multiple inheritance). This is accomplished by using ‘interface’ concept.  It is not possible to declare unsigned integers in java.  In java objects are passed by reference only. In C++ objects may be passed by value or reference. http://professional-guru.com

Cont … New features added in Java:  Multithreading, that allows two or more pieces of the same program to execute concurrently.  C++ has a set of library functions that use a common header file. But java replaces it with its own set of API classes.  It adds packages and interfaces.  Java supports automatic garbage collection.  break and continue statements have been enhanced in java to accept labels as targets.  The use of unicode characters ensures portability. http://professional-guru.com

Cont … Features that differ:  Though C++ and java supports Boolean data type, C++ takes any nonzero value as true and zero as false. True and false in java are predefined literals that are values for a boolean expression.  Java has replaced the destructor function with a finalize() function.  C++ supports exception handling that is similar to java's. However, in C++ there is no requirement that a thrown exception be caught. http://professional-guru.com

Characteristics of Java • Java is simple • Java is architecture-neutral • Java is object-oriented • Java is portable • Java is distributed • Java’s performance • Java is interpreted • Java is multithreaded • Java is robust • Java is dynamic • Java is secure http://professional-guru.com

Java Environment • Java includes many development tools, classes and methods – Development tools are part of Java Development Kit (JDK) and – The classes and methods are part of Java Standard Library (JSL), also known as Application Programming Interface (API). • JDK constitutes of tools like java compiler, java interpreter and many. • API includes hundreds of classes and methods grouped into several packages according to their functionality. http://professional-guru.com

Java is architecture-neutral JAVA Program Execution http://professional-guru.com

WORA(Write Once Run Anywhere) http://professional-guru.com

Editplus for Java Programming • Edit Plus Software: • EditPlus is a 32-bit text editor for the Microsoft Windows operating system. • The editor contains tools for programmers, including syntax highlighting (and support for custom syntax files), file type conversions, line ending conversion (between Linux, Windows and Mac styles), regular expressions for search-and-replace, spell check etc). http://professional-guru.com

http://professional-guru.com

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Java is one of the world's most important and widely used computer languages, and it has held this distinction for many years. Unlike some other computer languages whose influence has weared with passage of time, while Java's has grown. As of 2015, Java is one of the most popular programming languages in use, particularly for client-server web applications, with a reported 9 million developers using and working on it.

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Multithreading in Java

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Powerpoint Templates and Google slides for Java

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Presenting Small Java Based Program In Powerpoint And Google Slides Cpb slide which is completely adaptable. The graphics in this PowerPoint slide showcase four stages that will help you succinctly convey the information. In addition, you can alternate the color, font size, font type, and shapes of this PPT layout according to your content. This PPT presentation can be accessed with Google Slides and is available in both standard screen and widescreen aspect ratios. It is also a useful set to elucidate topics like Small Java Based Program. This well structured design can be downloaded in different formats like PDF, JPG, and PNG. So, without any delay, click on the download button now.

Presenting Java Computer Programming In Powerpoint And Google Slides Cpb slide which is completely adaptable. The graphics in this PowerPoint slide showcase four stages that will help you succinctly convey the information. In addition, you can alternate the color, font size, font type, and shapes of this PPT layout according to your content. This PPT presentation can be accessed with Google Slides and is available in both standard screen and widescreen aspect ratios. It is also a useful set to elucidate topics like Java Computer Programming. This well structured design can be downloaded in different formats like PDF, JPG, and PNG. So, without any delay, click on the download button now.

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Make your presentation profoundly eye-catching leveraging our easily customizable Java file format monotone icon in powerpoint pptx png and editable eps format. It is designed to draw the attention of your audience. Available in all editable formats, including PPTx, png, and eps, you can tweak it to deliver your message with ease.

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In the software industry, presentations play a major role as information can be conveyed easily in a presentable way via presentations. Using Java, with the help of Apache POI, we can create elegant presentations. Let us see in this article how to do that.

Necessary dependencies for using Apache POI:

It has support for both .ppt and .pptx files. i.e. via 

• HSLF implementation is used for the Powerpoint 97(-2007) file format 
• XSLF implementation for the PowerPoint 2007 OOXML file format.

There is no common interface available for both implementations. Hence for 

• .pptx formats, XMLSlideShow, XSLFSlide, and XSLFTextShape classes need to be used.
• .ppt formats, HSLFSlideShow, HSLFSlide, and HSLFTextParagraph classes need to be used.

Let us see the example of creating with .pptx format

Creation of a new presentation:

Next is adding a slide

Now, we can retrieve the XSLFSlideLayout and it has to be used while creating the new slide

Let us cover the whole concept by going through a sample maven project.

Example Maven Project

Project Structure:

As this is the maven project, let us see the necessary dependencies via pom.xml

PowerPointHelper.java

In this file below operations are seen

• A new presentation is created
• New slides are added
• save the presentation as

We can write Text, create hyperlinks, and add images. And also the creation of a list, and table are all possible. In general, we can create a full-fledged presentation easily as well can alter the presentation by adjusting the slides, deleting the slides, etc. Below code is self-explanatory and also added comments to get an understanding of it also.

We can able to get the presentation got created according to the code written and its contents are shown in the image below

We can test the same by means of the below test file as well

PowerPointIntegrationTest.java

Output of JUnit:

We have seen the ways of creating of presentation, adding text, images, lists, etc to the presentation as well as altering the presentation as well. Apache POI API is a very useful and essential API that has to be used in software industries for working with the presentation.

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