JVM 解读class文件

JVM 解读class文件 ## Class 文件结构  ## 常量池存放了哪些内容  ## 常量池数据结构   ## 实例 ### 源码 ``` package com.lglbc.day1; public class TesTClassCode { public String a; public String b; public static int add(int a, int b){ return a+b; } public static void main(String[] args) { System.out.println(add(1,2000)); } } ``` ### 解析后的常量池表 ```perl mthod_info 6,26 field_info 27,28 mthod_info 5,29 mthod_info 30,31 class_info 32 class_info 33 utf8_info 1 a utf8_info 18 Ljava/lang/String; utf8_info 1 b utf8_info 6 <init> utf8_info 3 ()V utf8_info 4 Code utf8_info 15 LineNumberTable utf8_info 18 LocalVariableTable utf8_info 4 this utf8_info 30 Lcom/lglbc/day1/TesTClassCode; utf8_info 3 add utf8_info 5 (II)I utf8_info 1 I utf8_info 4 main utf8_info 22 ([Ljava/lang/String;)V utf8_info 4 args utf8_info 19 [Ljava/lang/String; utf8_info 10 SourceFile utf8_info 18 TesTClassCode.java name_and_type 10 11 class_info 34 name_and_type 35 36 name_and_type 17 18 class_info 37 name_and_type 38 39 utf8_info 28 com/lglbc/day1/TesTClassCode utf8_info 16 java/lang/Object utf8_info 16 java/lang/System utf8_info 3 out utf8_info 21 Ljava/io/PrintStream; utf8_info 19 java/io/PrintStream utf8_info 7 println utf8_info 4 (I)V ```