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LET US TAKE A CASE:IF I COMPILED A .JAVA FILE AND I GOT .CLASS FILE,SUPPOSE IF I TAKE .CLASS FILE IN A FLOPPY AND TRY TO RUN ON THE OTHER MACHINE,WILL THE SYSTEM REQUIRED JDK OR JRE.
OTHER SYSTEM REQUIRED ONLY JDK NOT JRE,JDK IS A PART OF THE JRE(java run time enviornment)