JDK is Java Development KIT . This is needed to compile the java source code.
JRE is Java Runtime Environment .This contains JVM . This is needed to run a java program . It contains the libraries and other files that JVM uses at RunTime .
JVM is Java Virtual Machine . This runs the java bytecode.It is a specification that provides runtime environment in which java bytecode can be executed. The JVM performs following tasks: Loads the code Verifies the code Executes the code Provides the runtime environment
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