The Internet demonstrated how media-rich content could be made accessible in simple ways. The popularization of the World Wide Web made these attributes much more interesting.
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To meet these requirements, compiled code had to survive transport across networks, operate on any client, and assure the client that it was safe to run.
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It was designed to support multiple host architectures and to allow secure delivery of software components. The Java platform was initially developed to address the problems of building software for networked consumer devices. Its syntax is similar to C and C++, but it omits many of the features that make C and C++ complex, confusing, and unsafe. The Java programming language is a general-purpose object-oriented concurrent language. Attracted by a generally available, machine-independent platform, implementors of other languages are turning to the Java virtual machine as a delivery vehicle for their languages. However, any language with functionality that can be expressed in terms of a valid class file can be hosted by the Java virtual machine. A class file contains Java virtual machine instructions (or bytecodes) and a symbol table, as well as other ancillary information.įor the sake of security, the Java virtual machine imposes strong format and structural constraints on the code in a class file. The Java virtual machine knows nothing of the Java programming language, only of a particular binary format, the class file format. It may also be implemented in microcode or directly in silicon. It is not inherently interpreted, but can just as well be implemented by compiling its instruction set to that of a silicon CPU. However, the Java virtual machine does not assume any particular implementation technology, host hardware, or host operating system. Sun's current Java virtual machine implementations, components of its Java TM 2 SDK and Java TM 2 Runtime Environment products, emulate the Java virtual machine on Win32 and Solaris hosts in much more sophisticated ways. The first prototype implementation of the Java virtual machine, done at Sun Microsystems, Inc., emulated the Java virtual machine instruction set in software hosted by a handheld device that resembled a contemporary Personal Digital Assistant (PDA). It is reasonably common to implement a programming language using a virtual machine the best-known virtual machine may be the P-Code machine of UCSD Pascal. Like a real computing machine, it has an instruction set and manipulates various memory areas at run time. The Java virtual machine is an abstract computing machine. It is the component of the technology responsible for its hardware- and operating system- independence, the small size of its compiled code, and its ability to protect users from malicious programs. The Java virtual machine (JVM) is the cornerstone of the Java and Java 2 platforms. Java Virtual Machine from Sun Java Virtual Machine