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affordable web hosting search This month, we examine the Java Virtual Machine, which allows Java code to be executed on a wide variety of hardware and software environments. At the heart of the Java platform lies the Java Virtual Machine, or JVM. Most programming languages compile source code directly into machine code, suitable for execution on a particular microprocessor architecture. The difference with Java is that it uses bytecode - a special type of machine code. Java bytecode executes on a special type of microprocessor.
affordable web hosting search Strangely enough, there wasn't a hardware implementation of this microprocessor available when Java was first released. Instead, the processor architecture is emulated by what is known as a "virtual machine". This virtual machine is an emulation of a real Java processor - a machine within a machine (Figure One). The only difference is that the virtual machine isn't running on a CPU - it is being emulated on the CPU of the host machine. Figure One - JVM emulation run on a physical CPU The Java Virtual Machine is responsible for interpreting Java bytecode, and translating this into actions or operating system calls.
affordable web hosting search For example, a request to establish a socket connection to a remote machine will involve an operating system call. Different operating systems handle sockets in different ways - but the programmer doesn't need to worry about such details. It is the responsibility of the JVM to handle these translations, so that the operating system and CPU architecture on which Java software is running is completely irrelevant to the developer. Figure Two - JVM handles translations The Java Virtual Machine forms part of a large system, the Java Runtime Environment (JRE). Each operating system and CPU architecture requires a different JRE.
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