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How the Java virtual machine handles exceptions

A detailed study with examples of classes and methods

By Bill Venners, JavaWorld.com, 01/01/97

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To drive the simulation, just press the "Step" button. Each press of the "Step" button will cause the Java virtual machine to execute one bytecode instruction. To start the simulation over, press the "Reset" button. To cause the Java virtual machine to repeatedly execute bytecodes with no further coaxing on your part, press the "Run" button. The Java virtual machine will then execute the bytecodes until the "Stop" button is pressed. The text area at the bottom of the applet describes the next instruction to be executed. Happy clicking.

About the author

Bill Venners has been writing software professionally for 12 years. Based in Silicon Valley, he provides software consulting and training services under the name Artima Software Company. Over the years he has developed software for the consumer electronics, education, semiconductor, and life insurance industries. He has programmed in many languages on many platforms: assembly language on various microprocessors, C on Unix, C++ on Windows, Java on the Web. He is author of the book: Inside the Java Virtual Machine, published by McGraw-Hill.
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Resources
  • The book The Java Virtual Machine Specification, by Tim Lindholm and Frank Yellin (ISBN 0-201-63452-X), part of The Java Series (http://www.aw.com/cp/javaseries.html), from Addison-Wesley, is be the definitive Java virtual machine reference.
    http://www.aw.com/cp/lindholm-yellin.html
  • Previous Under The Hood articles
  • The lean, mean virtual machine -- Gives an introduction to the Java virtual machine. Look here to see how the garbage collected heap fits in with the other parts of the Java virtual machine.
  • The Java class file lifestyle -- Gives an overview to the Java class file, the file format into which all Java programs are compiled.
  • Java's garbage-collected heap -- Gives an overview of garbage collection in general and the garbage-collected heap of the Java virtual machine in particular.
  • Bytecode basics -- Introduces the bytecodes of the Java virtual machine, and discusses primitive types, conversion operations, and stack operations in particular.
  • Floating Point Arithmetic -- Describes the Java virtual machine's floating point support and the bytecodes that perform floating point operations.
  • Logic and Arithmetic -- Describes the Java virtual machine's support for logical and integer arithmetic, and the related bytecodes.
  • Objects and Arrays -- Describes how the Java virtual machine deals with objects and arrays, and discusses the relevant bytecodes.