javap -verbose 查看字节码

package com.icnws;
public class Test12 {
private int m;
public int inc(){
return m+1;
}
}

D:\workspace\jvm\out\production\jvm\com\icnws>javap -verbose Test12.class

Classfile /D:/workspace/jvm/out/production/jvm/com/icnws/Test12.class
Last modified 2015-8-2; size 364 bytes
MD5 checksum c06784dbb94a08b5a754ac0c4bf1c3ab
Compiled from "Test12.java"
public class com.icnws.Test12
SourceFile: "Test12.java"
minor version: 0
major version: 51
flags: ACC_PUBLIC, ACC_SUPER
Constant pool:
#1 = Methodref          #4.#18         //  java/lang/Object."":()V
#2 = Fieldref           #3.#19         //  com/icnws/Test12.m:I
#3 = Class              #20            //  com/icnws/Test12
#4 = Class              #21            //  java/lang/Object
#5 = Utf8               m
#6 = Utf8               I
#7 = Utf8
#8 = Utf8               ()V
#9 = Utf8               Code
#10 = Utf8               LineNumberTable
#11 = Utf8               LocalVariableTable
#12 = Utf8               this
#13 = Utf8               Lcom/icnws/Test12;
#14 = Utf8               inc
#15 = Utf8               ()I
#16 = Utf8               SourceFile
#17 = Utf8               Test12.java
#18 = NameAndType        #7:#8          //  "":()V
#19 = NameAndType        #5:#6          //  m:I
#20 = Utf8               com/icnws/Test12
#21 = Utf8               java/lang/Object
{
public com.icnws.Test12();
flags: ACC_PUBLIC
Code:
stack=1, locals=1, args_size=1
0: aload_0
1: invokespecial #1                  // Method java/lang/Object."
":()V
4: return
LineNumberTable:
line 2: 0
LocalVariableTable:
Start  Length  Slot  Name   Signature
0       5     0  this   Lcom/icnws/Test12;

public int inc();
flags: ACC_PUBLIC
Code:
stack=2, locals=1, args_size=1
0: aload_0
1: getfield      #2                  // Field m:I
4: iconst_1
5: iadd
6: ireturn
LineNumberTable:
line 5: 0
LocalVariableTable:
Start  Length  Slot  Name   Signature
0       7     0  this   Lcom/icnws/Test12;
}