Requisites to run a Java Program

To compile and run a java program , we need the following

1. JDK , JRE  .(We could download this from :  http://www.oracle.com/technetwork/java/javase/downloads/jdk6-downloads-1637591.html ) 

2.Install the jdk and Jre by running the set up.

2. An IDE(We use eclipse here. Please download Eclipse IDE for Java EE Developers from http://www.eclipse.org/downloads/)

Setting Environment Variables:

We  should set the environment variables in order to successfully execute our java program.

In Windows Operating system,

1.Right click Computer ->Properties ->Advanced Systems settings->Advanced ->Environmental Variables

2.Click on New. 

•  Variable name should be PATH 

            Should point to the path of bin folder of the jdk folder installed. 

        Click on OK to save this.

•  Add another environment variable by clicking on new . Variable name :CLASSPATH 

              

This should point to the lib folder of the JRE installed. Click on OK to save this.

• Add another variable JAVA_HOME. This should point to the JRE Folder installed.

                  

                                       

      Click on OK to save this.

•       Download the eclipse zip folder  and extract the same to a folder. Run the eclipse.exe file.
•       Create a new folder and use the same as workspace.
•       To create a new java project. Click on File -> New -> Java Project
•       Enter the name of the project, click on OK to continue.
•       Once the project has been created, right click on the same to create a new Java class. New-> class.(Eg. Hello)

Sample code to test the setup:

public class Hello {

public static void main(String[] args) {

System.out.println("hello");

}

}

Right click on the code as shown below and and Run the code by clicking on Run as ->Java Application

This will print hello in the console.

Thanks for your time...