In order to execute the application you need to set the path of the JDK in environmental variables
like this if u have installed Java in C dirve
C:\Pragram Files\Java|jdk1.3\bin;
JVM is required to run the program that is avialable with the Jdk package.

to set the path on my comuter right click, advanced settings in that environment variables,select new as path and paste above path then in ur comand prompt type javac ur compiler is ready to comile .java to .class file ok my frnd