intro.html

Inside the java virtualMachine,深入研究java虚拟机

<P>This chapter gives an overview of the security model built into Java韘 core architecture.</P>
<P><H3>Chapter 4. Network-mobility</H3></P>
<P>This chapter examines the new paradigm of network-mobile software heralded by the arrival of Java, and shows how Java韘 architecture makes it possible.</P>
<P><H2>Part Two: Java Internals</H2></P>
<P><H3>Chapter 5. The Java Virtual Machine</H3></P>
<P>This chapter gives a detailed overview of the Java Virtual Machine韘 internal architecture. Accompanying the chapter on the CD-ROM is an applet, named Eternal Math, that simulates the Java Virtual Machine executing a short sequence of bytecodes.</P>
<P><H3>Chapter 6. The Java Class File</H3></P>
<P>This chapter describes the contents of the class file, including the structure and format of the constant pool, and serves as both a tutorial and a complete reference of the Java class file format. Accompanying the chapter on the CD-ROM is an applet, named Getting Loaded, that simulates the Java Virtual Machine loading a Java class file.</P>
<P><H3>Chapter 7. The Lifetime of a Class</H3></P>
<P>This chapter follows the lifetime of a type (class or interface) from the type韘 initial entrance into the virtual machine to its ultimate exit. It discusses the processes of loading, linking, and initialization; object instantiation, garbage collection, and finalization; and type finalization and unloading.</P>
<P><H3>Chapter 8. The Linking Model</H3></P>
<P>This chapter takes an in-depth look at Java韘 linking model. It describes constant pool resolution and shows how to write class loaders to enable a Java application to dynamically extend itself at run-time.</P>
<P><H3>Chapter 9. Garbage Collection</H3></P>
<P>This chapter describes various garbage collection techniques and explains how garbage collection works in Java Virtual Machines. Accompanying this chapter on the CD-ROM is an applet, named Heap of Fish, that simulates a compacting, mark-and-sweep garbage-collected heap.</P>
<P><H3>Chapter 10. Stack and Local Variable Operations</H3></P>
<P>This chapter describes the Java Virtual Machine instructions that focus most exclusively on the operand stack--those that push constants onto the operand stack, perform generic stack operations, and transfer values back and forth between the operand stack and local variables. Accompanying this chapter on the CD-ROM is an applet, named Fibonacci Forever, that simulates the Java Virtual Machine executing a method that generates the Fibonacci sequence.</P>
<P><H3>Chapter 11. Type Conversion</H3></P>
<P>This chapter describes the instructions that convert values from one primitive type to another. Accompanying the chapter on the CD-ROM is an applet, named Conversion Diversion, that simulates the Java Virtual Machine executing a method that performs type conversion.</P>
<P><H3>Chapter 12. Integer Arithmetic</H3></P>
<P>This chapter describes integer arithmetic in the Java Virtual Machine. It explains two韘 complement arithmetic and describes the instructions that perform integer arithmetic. Accompanying this chapter on the CD-ROM are two applets that interactively illustrate the material presented in the chapter. One applet, named Inner Int, allows you to view and manipulate a two韘 complement number. The other applet, named Prime Time, simulates the Java Virtual Machine executing a method that generates prime numbers.</P>
<P><H3>Chapter 13. Logic</H3></P>
<P>This chapter describes the instructions that perform bitwise logical operations inside the Java Virtual Machine. These instructions include opcodes to perform shifting and boolean operations on integers. Accompanying this chapter on the CD-ROM is an applet, named Logical Results, that simulates the Java Virtual Machine executing a method that includes uses several of the logic opcodes.</P>
<P><H3>Chapter 14. Floating Point Arithmetic</H3></P>
<P>This chapter describes the floating point numbers and the instructions that perform floating point arithmetic inside the Java Virtual Machine. Accompanying this chapter on the CD-ROM are two applets that interactively illustrate the material presented in the chapter. One applet, named Inner Float, allows you to view and manipulate the individual components that make up a floating point number. The other applet, named Circle of Squares, simulates the Java Virtual Machine executing a method that uses several of the floating point opcodes.</P>
<P><H3>Chapter 15. Objects and Arrays</H3></P>
<P>This chapter describes the Java Virtual Machine instructions that create and manipulate objects and arrays. Accompanying this chapter on the CD-ROM is an applet, named Three-Dimensional Array, that simulates the Java Virtual Machine executing a method that allocates and initializes a three-dimensional array.</P>
<P><H3>Chapter 16. Control Flow</H3></P>
<P>This chapter describes the instructions that cause the Java Virtual Machine to conditionally or unconditionally branch to a different location within the same method. Accompanying this chapter on the CD-ROM is an applet, named Saying Tomato, that simulates the Java Virtual Machine executing a method that includes bytecodes that perform table jumps (the compiled version of a Java <FONT FACE="Courier New">switch</FONT> statement).</P>
<P><H3>Chapter 17. Exceptions</H3></P>
<P>This chapter shows how exceptions are implemented in bytecodes. It describes the instruction for throwing an exception explicitly, explains exception tables, and shows how catch clauses work. Accompanying this chapter on the CD-ROM is an applet, named Play Ball!, that simulates the Java Virtual Machine executing a method that throws and catches exceptions.</P>
<P><H3>Chapter 18. Finally Clauses</H3></P>
<P>This chapter shows how finally clauses are implemented in bytecodes. It describes the relevant instructions and gives examples of their use. The chapter also describes some surprising behaviors exhibited by finally clauses in Java source code and explains this behavior at the bytecode level. Accompanying this chapter on the CD-ROM is an applet, named Hop Around, that simulates the Java Virtual Machine executing a method that includes finally clauses.</P>
<P><H3>Chapter 19. Method Invocation and Return</H3></P>
<P>This chapter describes the four instructions that the Java Virtual Machine uses to invoke methods and the situations in which each instruction is used.</P>
<P><H3>Chapter 20. Thread Synchronization</H3></P>
<P>This chapter describes monitors--the mechanism that Java uses to support synchronization--and shows how they are used by the Java Virtual Machine. It shows how one aspect of monitors, the locking and unlocking of data, is supported in the instruction set.</P>
<P><H2>The Appendices</H2></P>
<P><H3>Appendix A. Instruction Set by Opcode Mnemonic</H3></P>
<P>This appendix lists the opcodes alphabetically by mnemonic. For each opcode, it gives the mnemnonic, opcode byte value, instruction format (the operands, if any), a snapshot image of the stack before and after the instruction is executed, and a description of the execution of the instruction. Appendix A serves as the primary instruction set reference of the book.</P>
<P><H3>Appendix B. Opcode Mnemonic by Functional Group</H3></P>
<P>This appendix organizes the instructions by functional group. The organization used in this appendix corresponds to the order the instructions are described in Chapters 10 through 20.</P>
<P><H3>Appendix C. Opcode Mnemonic by Opcode</H3></P>
<P>This appendix organizes the opcodes in numerical order. For each numerical value, this appendix gives the mnemonic.</P></BODY>
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