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用Java实现JVM第三章《解析class文件》附[classReader拆解]

案例介绍按照如下虚拟机规范，本文主要介绍java版本jvm提取class字节码方式。在java中没有无符号类型，例如js中byte取值是0~255、java中是-128 ~ +127，所以在实际处理字节码时[虚拟机规范u1、u2、u4]，需要进行转换。[java虚拟机规范]每个Class文件都是由8...

用Java实现JVM第三章《解析class文件》

案例介绍本案例主要介绍通过java代码从class文件中解析；class文件、常量池、属性表；作为类（或者接口）信息的载体，每个class文件都完整地定义了一个类。为了使java程序可以“编写一次，处处运行”，Java虚拟机规范对class文件格式进行了严格的规定。但是另外一方面，对于...

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用Java实现JVM第三章《解析class文件》附[classReader拆解]

[java虚拟机规范]每个Class文件都是由8字节为单位的字节流组成，所有的16位、32位和64位长度的数据将被构造成2个、4个和8个8字节单位来表示。多字节数据项总是按照 Big-Endian的顺序进行存储。①Big-Endian 顺序是指按高位字节在地址最低位，最低字节在地址最高位来存储数据，...

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