Demo.java –> Class Demo java Source code
Javac –> It is a java compiler
Byte code –> Demo.class
jvm –> Java virtual machine code / native code it is a interpreter
In java java.lang package is default package
Which is the most important package in java.
Whenever you install jdk by default you will get 14 packages in all among packages java.lang is very impotent package in java.
Without this package you can not run any single java program.
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