Java Virtual Machine

<language, architecture> (JVM) A specification for software which interprets Java programs that have been compiled into byte-codes, and usually stored in a ".class" file.

The JVM instruction set is stack-oriented, with variable instruction length.

Unlike some other instruction sets, the JVM's supports object-oriented programming directly by including instructions for object method invocation (similar to subroutine call in other instruction sets).

The JVM itself is written in C and so can be ported to run on most platforms.

It needs thread support and I/O (for dynamic class loading).

The Java byte-code is independent of the platform.

There are also some hardware implementations of the JVM.

Specification (

Sun's Java chip (,4,9328,00.html).



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