First of all, you have to set your environment. It includes
1 Setting the path variable
Go into the directory where you have installed Java
eg C:\Program Files\Java\jdk1.6.0_07\bin
Copy the corresponding path on your machine
This gives the location of java compiler
Now right click on My computer > Properties > Advanced > Environment variables
Click New in System Variables
Enter path in variable name field
Paste the directory path in Variable value field and click on Ok
Close it
2 Setting classpath
Create a folder which will contain your programs
Copy it's path
Create a new System variable with name as classpath and
value as the path of your new directory
Click Ok and close
3 Sample code
class first
{
public static void main ( String args [] )
{
System.out.println ("First Java program") ;
} // main function ends
} // class ends
You can copy this code in a notepad file with name first and extension .java
and save it in the
folder created above
4 Running the program
Click on Start > Run or Press Windows key and then R
Type cmd and press enter
Type cd path
where path is the location of your folder for programs (same as classpath)
Type javac first.java and press enter
A class file should appear in the directory
Now type java first and press enter
First Java program should get printed on the screen
See Details for explanation of code
