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webmaster webmaster When source code (the instructions that make up a program) are compiled, it is converted to machine code which can be executed only on one type of machine. This process produces native code, which is extremely fast. Another type of language is one that is interpreted. Interpreted code is read by a software application (the interpreter), which performs the specified actions. Interpreted code often doesn't need to be compiled - it is translated as it is run.

webmaster For this reason, interpreted code is quite slow, but often portable across different operating systems and processor architectures. Java takes the best of both techniques. Java code is compiled into a platform-neutral machine code, which is called Java bytecode. A special type of interpreter, known as a Java Virtual Machine (JVM), reads the bytecode, and processes it. Figure One shows a disassembly of a small Java application.

webmaster The bytecode, indicated by the arrow, is represented in text form here, but when compiled it is represented as bytes to conserve space. Figure One - Bytecode disassembly for "HelloWorld" The approach Java takes offers some big advantages over other interpreted languages. Firstly, the source code is protected from view and modification - only the bytecode needs to be made available to users. Secondly, security mechanisms can scan bytecode for signs of modification or harmful code, complimenting the other security mechanisms of Java. Most of all though, it means that Java code can be compiled once, and run on any machine and operating system combination that supports a Java Virtual Machine (JVM).

webmaster Java can run on Unix, Windows, Macintosh, and even the Palm Pilot. Java can even run inside a web browser, or a web server. Being portable means that the application only has to be written once - and can then execute on a wider range of machines. This saves a lot of time, and money. Multi-threaded If you've ever written complex applications in C, or PERL, you'll probably have come across the concept of multiple processes before.

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