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Java Virtual Machine
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The Java Virtual Machine is the software implementation of a "CPU" designed to run compiled Java code. This includes stand-alone Java applications, as well as "applets" that are downloaded and run in Web browsers such as the NetScape Navigator. This book is a comprehensive programming guide for the Java Virtual Machine (JVM). The book is divided into two sections: the first section includes information on the semantics and structure of the JVM; the second section is a reference of the JVM instructions, or "opcodes." This book is intended to give readers a strong overview and reference of the JVM so that they may create their own implementations of the JVM or write their own compilers that create Java object code. The programming guide includes numerous examples written in Java assembly language.
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The Java Virtual Machine is the cornerstone of Sun's Java programming language. It is the component of the Java technology responsible for Java's cross-platform delivery, the small size of its compiled code, and Java's ability to protect users from malicious programs. The Java Virtual Machine is an abstract computing machine. Like a real computing machine, it has an instruction set and uses various memory areas. 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. (Get the book!)
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Java Virtual Machine (JVM), originally developed by Sun Microsystems, is a virtual machine that executes Java bytecode. This code is most often generated by Java language compilers, although the JVM has ... been targeted by compilers of other languages. The JVM is a crucial component of the Java Platform. The availability of JVMs on many types of hardware and software platforms enables Java to function both as middleware and a platform in its own right. Hence the expression "Write once, run anywhere." Starting with J2SE 5.0, changes to the JVM specification have been developed under the Java Community Process as JSR 924.
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The second edition of Bill Venners' Inside the Java Virtual Machine, winner of a 1998 Java Report Writers Choice Award, is now available in bookstores. Inside the Java Virtual Machine explains Java's architecture and internals, and several Java APIs closely tied to the virtual machine, to Java programmers. Reading this book will help you gain a deeper understanding of Java technology, and in the process, help you become more effective at Java programming. This new edition is fully revised for Java 2, and includes much new material on a variety of JVM topics. You can order the book from Amazon by clicking on the image to the right.
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The Java Virtual Machine (JVM) is included in the Java 2 Standard Edition (J2SE™) software, which is required by the Application Server. Because incorrect JVM settings will prevent the server from running, you should take care when changing these settings.
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The "virtual hardware" of the Java Virtual Machine can be divided into four basic parts: the registers, the stack, the garbage-collected heap, and the method area. These parts are abstract, just like the machine they compose, but they must exist in some form in every JVM implementation.
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Java Virtual Machine