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Each client machine must run Java interpreter which performs runtime execution of Java bytecodes.
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Java interpreter is written in POSIX compliant ANSI C and needs to be ported to and conventionally compiled (once) on each individual platform.
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Once the interpreter is ported, application developers don't need to worry at all about platform specificity and differences between native compilers.
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They write portable Java which is compiled by platform independent Java compiler and executed on Java interpreter, ported to various platforms.
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