java compiler makes the class file which is not dependent 
on the hardware or software of the system where we compiled.
Every system has its own JVM(System dependent) and will 
takes .class file and produces the code which is executable 
on that particular system itself. 
So JVM makes the code portability.
hence JVM makes the JAVA as Platform Independent.
JAVA-JVM=NO USE of producing System indipendent code.