We will be writing a simple program called the Hello World program First open up notepad then type the folowing into your notepad. class HelloWorld { public static void main (String[] args) { System.out.println("Hello World"); } } Then save it as HelloWorld.java

Compiling

First open a DOS window and go to the directory where the helloworld file you saved is. type in javac HelloWorld and hit enter if this fails and says something like javac isn't a recognised command then you have to go to My Computer and click View system information then click the Advanced tab then click environmental Variables then click new what you put in variable name is PATH then for Variable Value you put in the directory where the java file is.

Running

Open a DOS window and go to the directory where the .class version of your HelloWorld file is then type java HelloWorld and the out put you should get is Hello World!.