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Portability

If you start of with Java, you will hear this term more than any other. Another phrase you'll see is 'Write Once, Run Anywhere'. The Java platform is portable in a sense that its bytecode can be ported to any other machine that implements that Java platform version. Java Virtual Machines are available from a large number of vendors. Portability has its price: speed. Even though you'll hear that Java programs may become almost as fast as programs written in C or C++, this does not apply to numerical computation programs. Run-time checking of array references, not having direct control over memory allocation and deallocation, and the underlying object-oriented style overhead will always result in slower running code.

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