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virtual machine
Last modified: April 12, 1997

 related categories
 Operating Systems
 Programming
related terms
 Java
 Jini
 JIT
 JNI
 operating environment
 virtual

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A self-contained operating environment that behaves as if it is a separate computer. For example, Java applets run in a Java virtual machine (VM) that has no access to the host operating system. This design has two advantages:

  • System Independence: A Java application will run the same in any Java VM, regardless of the hardware and software underlying the system.
  • Security: Because the VM has no contact with the operating system, there is little possibility of a Java program damaging other files or applications.
  • The second advantage, however, has a downside. Because programs running in a VM are separate from the operating system, they cannot take advantage of special operating system features.



    For internet.com pages about virtual machine, . Also, check out the following links!

    Related Links

    The Java Virtual Machine Specification
    Description of and link to the online version of the book entitled "The Java Virtual Machine Specification" by Sun's own designers of the Java VM, Tim Lindholm and Frank Yellin. Updated on Aug 4, 1998

    Yahoo!'s Jave Virtual Machines page
    Yahoo!'s directory of Java Virtual Machines. Updated on Aug 2, 1998

    Yahoo!'s parallel virtual machines page
    Yahoo!'s directory of parallel virtual machines. Updated on Aug 4, 1998


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