Answer Posted / sandeep chauhan

the program is written in any language is called the source
program.and after compilation source code we get the object
code.so in java the source program is in ".java" file.when
this is compiled the object code will be in the ".class"
file.and this object code is bytecode.and this is is not
executable directly by any machine or o.s. so there will be
java virtual machine(jvm) which is an interpreter and
interpret the compiled object code into machine
understandable language.and which is executable for
machine.but every machine have its own jvm.and so this
bytecode can be executed in any machine according to there
jvm.so java is plateform independent language.

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