Answer Posted / p.l.n.kumar

JDK is a software bundle consists of binary files such as
(javac,java,javadoc,jdb,javap,rmic....),java library files
(both old and new)and some header files. Development
environment requires this software.

JRE is also a software bundle same as JDK excluded with
some binary files( especially compiler - javac and
rmic ).Required to run applications of production
environment ( on client host system ).

JVM is available in both JDK and JRE. Java.exe file is used
to initiate VM process.The default heap size is 2MB and the
Max.heap size is 64MB.VM comes in two flavours...

-Hotspot client VM
-Hotspot server VM

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