Answer Posted / tarun

JDK : JDK contails JRE and JVM both. JDK is required to
complie. JDK contains of many .exe supporting files and
javac, javap, java,javaw, javaws ,all these are helping to
compile the java programs. If we have to compile our own
written java program JDK should be define in our classpath.
after compilation it converts the code into the bytecode.

JRE : JRE is needed for run time environment. It contains JVM.

JVM : Java Virtual Machine converts the bytecode into user
understandable code. without JVM we cannot run our Java
codes on any system. JVM converts the bytecode got after
compilation into machine level code by understanding the
hardware and operating system combination.

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