unable to compile java program from command prompt in Windows 7

Question

I have set Path and ClassPath environment variables. But still I am unable to compile my HelloWorld.java program from command prompt. Please help me compile and run java program from command prompt

CLASSPATH C:\Program Files\Java\jre6\lib

Path C:\Program Files\Java\jre6\bin\

Answer 1

You need to add JDK's directory to your path variable (not your JRE's path as you are actually doing it). JDK is usually in:

C:\Program Files\Java\jdk1.6.0_xx\bin\

Where xx stands for update number you have installed. Then just compile HelloWorld by using:

C:\Your\dir\where\HelloWorld\Is\>javac HelloWorld.java

In case you don't have JDK installed and you have only JRE installed, you won't be able to compile anything. You will need to download and install JDK properly to do Java Development in general (including compiling stuff).