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Introduction to Java
i) Introducing Java Programming Language
ii) Java Environment Setup
iii) Java Program Structure
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i) Introducing Java Programming Language
> Java Programming Language was developed at Sun Microsystems in 1991 (The first publicly available version of Java (Java 1.0) released in 1995, Now it is subsidiary of Oracle corporation.
> Java is an Object oriented Programming language, In Java every thing is object, java can be easily extended since it is based on Object model.
> Java is a Platform independent language, it can be compiled and Interpreted.
> Java is simple, easy to learn and implement.
> Java is Securable, using Java we can develop virus free and tamper free systems.
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Usage of Java
> To develop Desktop Applications (ex: Acrobat Reader)
> To develop Web Applications
> To develop Enterprise Applications (Ex: Banking, Insurance Applications etc...)
> To develop Mobile Applications
> To develop Embedded Systems.
> Smart Cards
> Games software etc...
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> Test Automation
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Java Syntax Rules
> Java is a case sensitive language.
> First letter of Class name should be in Upper case.
> Method names should start with lower case letter.
> Java program file name should exactly match with class name.
> Java program execution starts from main method, which is mandatory in every Java program.
> Every statement/step should end with semi colon symbol.
> Code blocks enclosed with {}.
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ii) Java Environment Setup
Steps:
1) Download Java Software (JDK) and Install.
2) Set Environment Variable path (Path variable)
3) Download Eclipse IDE and extract
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Download Java (JDK) Software from either java.com or oracle.com, and Install.
After Java Installation then you can get Java folder in C:\Program Files.
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Set Environment Variable path (Path variable)
Navigation
First take jdk bin directory path
Select MyComputer and right click
> Properties
> Advanced System Settings
> Environment Variables
> Select Path variable from system variables
> Edit
> Paste java bin directory path in variable value field
> OK
> Ok
>OK
> Close
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1) write and execute a Java program using command promt.
2) write and execute a Java program using Eclipse IDE.
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1) write and execute a Java program using command prompt.
In Computer Programming we have three steps.
i) Write Program
ii) Compile the Program
iii) Run / Execute the program.
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Step 1: Write a Program
public class Sample {
public static void main (String [] args) {
System.out.println ("Hello Java World");
}
}
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Step 2: Compile the Program
> Launch Command prompt
> Chang to Java program file directory.
> Type javac Sample.java
* It creates Java class file
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Step 3: Run / Execute the program.
Type java Sample
Then it display the Output on the Console.
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2) write and execute a Java program using Eclipse IDE.
Eclipse IDE (Integrated Development Environment)
> Eclipse IDE is a platform to write and execute computer programs like Java, Perl, Python, Ruby, PHP etc...
> Eclipse IDE is open source.
> It provides Editor for writing programs, Syntax guidence, Context help, auto compilation etc...
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Steps to Write and Execute a Java Program using Eclipse IDE :
> Launch Eclipse IDE
> Create Java Project
> Create Java Package
> Create Java Class
Write Java Program and Run.
Note: Eclipse IDE provides auto compilation facility.
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A Sample Java Program
package abcd;
public class Smitha {
public static void main(String[] args) {
int a = 100;
System.out.println("Hello Java");
System.out.println(a);
}
}
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