What is JVM, JRE and JDK


  • Java Virtual Machine
  • Converts byte code to machine specific code
  • Platform dependent
  • Supports memory management, garbage collection, security etc
  • Customizable.  Min and Max memory can be customized
  • Provides a generic interface not based on underlying OS and Machine


  • Java Runtime Environment
  • JRE = JVM + Java  Standard  ClLass  Libraries (Math, lang etc) + Runtime Libraries
  • Need JRE for executing a Java Program


  • Java Development Kit
  • Contains tool to develop Java Programs, compile , AppletView etc
  • Contains JRE to run the Java Programs
  • Compiler converts Java code to Byte Code

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