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Platform Independency


Joined: Aug 05, 2003
Posts: 5
Java is called as a platform Independent language, as when compiled it generates a class file which is in byte code. What is this byte code, what is the importance of this bytecode? And if by using this technique one can implement platform independency, why it is not getting implemented for all languages?
Can any one please clear my doubts....
Ernest Friedman-Hill
author and iconoclast

Joined: Jul 08, 2003
Posts: 24199

To run a Java program, you need a JVM -- a "Java Virtual Machine". This is basically a simulation of an imaginary computer. The "machine language" of this imaginary computer is Java bytecode. This lets the same program -- the same bytecode -- run on any real computer for which a JVM has been implemented.
It's actually an old technique, and has been implemented for many other languages. The newest version is Microsoft's CLI, Common Language Interface (Infrastructure?), the core of .NET .

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Dirk Schreckmann

Joined: Dec 10, 2001
Posts: 7023
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Barry Gaunt
Ranch Hand

Joined: Aug 03, 2002
Posts: 7729
It is also interesting to note that the bytecode interpreted by the Java Virtual Machine can be produced by languages other than Java. See here for instance.

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It is sorta covered in the JavaRanch Style Guide.
subject: Platform Independency
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