![]() 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
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