Oracle官网有很多原汁原味的文档, 非常值得研读和学习. 今天来看一下The Java Virtual Machine Specification 都讲了些什么.
1. Introduction
Java是一门多用途, 并发, 面向对象的语言. 它的语法与C,C++相似, 但摒弃了很多令C, C++复杂难懂和不安全的特性. Java最先是用来解决联网的消费产品的软件构建问题. 被设计成支持各种主机架构, 并支持安全构建软件组件. 为了满足这些要求, 被编译过的code在网络传输, 支持任何机器, 保证主机安全的要求中幸存下来.
2. The Structure of the Java Virtual Machine
Chapter 2 gives an overview of the Java Virtual Machine architecture.
3. Compiling for the Java Virtual Machine
Chapter 3 introduces compilation of code written in the Java programming language into the instruction set of the Java Virtual Machine.
4. The class File Format
Chapter 4 occupies a big portion in this document, it specifies the class file format, the hardware- and operating systemindependent binary format used to represent compiled classes and interfaces.
5. Loading, Linking, and Initializting
Chapter 5 specifies the start-up of the Java Virtual Machine and the loading, linking, and initialization of classes and interfaces
6. The Java Virtual Machine Instruction Set
Chapter 6 specifies the instruction set of the Java Virtual Machine, presenting the instructions in alphabetical order of opcode mnemonics.
7. Opcode Mnemonics by Opcode
Chapter 7 gives a table of Java Virtual Machine opcode mnemonics indexed by opcode value