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Logic and integer arithmetic

A look at the bytecodes of the Java virtual machine that perform logical and arithmetic operations

By Bill Venners, JavaWorld.com, 11/11/96

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To drive the simulation, just press the Step button. Each press of the Step button will cause the JVM to execute one bytecode instruction. To start the simulation over, press the "Reset" button. To cause the JVM to repeatedly execute bytecodes with no further coaxing on your part, press the "Run" button. The JVM 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.



You need a Java-enabled browser to view this applet.


Click here for the source code of Logical Results, or here for the source code of Exposed Int.

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
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  • Floating point arithmetic -- Discusses the Java virtual machine's floating point support and the bytecodes that perform floating point arithmetic.