- 用法 javap <选项> class文件路径
常用: javap -c -v class文件路径
- 选项列表
-help --help -? 输出此用法消息
-version 版本信息
-v -verbose 输出附加信息
-l 输出行号和本地变量表
-public 仅显示公共类和成员
-protected 显示受保护的/公共类和成员
-package 显示程序包/受保护的/公共类
和成员 (默认)
-p -private 显示所有类和成员
-c 对代码进行反汇编
-s 输出内部类型签名
-sysinfo 显示正在处理的类的
系统信息 (路径, 大小, 日期, MD5 散列)
-constants 显示最终常量
--module <模块>, -m <模块> 指定包含要反汇编的类的模块
--module-path <路径> 指定查找应用程序模块的位置
--system <jdk> 指定查找系统模块的位置
--class-path <路径> 指定查找用户类文件的位置
-classpath <路径> 指定查找用户类文件的位置
-cp <路径> 指定查找用户类文件的位置
-bootclasspath <路径> 覆盖引导类文件的位置
GNU 样式的选项可使用 = (而非空白) 来分隔选项名称
及其值。
每个类可由其文件名, URL 或其
全限定类名指定。示例:
path/to/MyClass.class
jar:file:///path/to/MyJar.jar!/mypkg/MyClass.class
java.lang.Object
- 示例文件
package com.coding.asm.test;
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
public class Abc<K, V> extends LinkedHashMap<K, V> implements Iterable<K> {
private static int a;
private static final double b = 1000.01D;
private Map<K, V> c;
public int getA() {
return this.a;
}
public void setA(int var1) {
this.a = var1;
}
public Map<K,V> getC() {
return this.c;
}
public void setC(Map<K,V> var1) {
this.c = var1;
}
public Abc() {
}
public Iterator iterator2(K var1, V var2) {
return null;
}
public Iterator<K> iterator() {
return null;
}
public Integer compareTo(Integer var1) {
return var1;
}
public K getA(V var1) {
return null;
}
public List<File> get() {
ArrayList var1 = new ArrayList();
return var1;
}
public static void main(String[] var0) {
System.out.println("Hello Main!");
}
public void print() {
System.out.println("Hello ASM!");
}
}
javap -c -v ./Abc.class 反汇编并输出附加信息
Classfile /Users/micocube/Documents/Utils4j/target/classes/com/coding/asm/test/Abc.class
Last modified Jan 15, 2019; size 2532 bytes
MD5 checksum 99abe1aa8dc262de3a2717383298195c
Compiled from "Abc.java"
public class com.coding.asm.test.Abc<K extends java.lang.Object, V extends java.lang.Object> extends java.util.LinkedHashMap<K, V> implements java.lang.Iterable<K>
minor version: 0
major version: 52
flags: (0x0021) ACC_PUBLIC, ACC_SUPER
this_class: #10 // com/coding/asm/test/Abc
super_class: #11 // java/util/LinkedHashMap
interfaces: 1, fields: 3, methods: 12, attributes: 2
Constant pool:
#1 = Fieldref #10.#71 // com/coding/asm/test/Abc.a:I
#2 = Fieldref #10.#72 // com/coding/asm/test/Abc.c:Ljava/util/Map;
#3 = Methodref #11.#73 // java/util/LinkedHashMap."<init>":()V
#4 = Class #74 // java/util/ArrayList
#5 = Methodref #4.#73 // java/util/ArrayList."<init>":()V
#6 = Fieldref #75.#76 // java/lang/System.out:Ljava/io/PrintStream;
#7 = String #77 // Hello Main!
#8 = Methodref #78.#79 // java/io/PrintStream.println:(Ljava/lang/String;)V
#9 = String #80 // Hello ASM!
#10 = Class #81 // com/coding/asm/test/Abc
#11 = Class #82 // java/util/LinkedHashMap
#12 = Class #83 // java/lang/Iterable
#13 = Utf8 a
#14 = Utf8 I
#15 = Utf8 b
#16 = Utf8 D
#17 = Utf8 ConstantValue
#18 = Double 1000.01d
#20 = Utf8 c
#21 = Utf8 Ljava/util/Map;
#22 = Utf8 Signature
#23 = Utf8 Ljava/util/Map<TK;TV;>;
#24 = Utf8 getA
#25 = Utf8 ()I
#26 = Utf8 Code
#27 = Utf8 LineNumberTable
#28 = Utf8 LocalVariableTable
#29 = Utf8 this
#30 = Utf8 Lcom/coding/asm/test/Abc;
#31 = Utf8 LocalVariableTypeTable
#32 = Utf8 Lcom/coding/asm/test/Abc<TK;TV;>;
#33 = Utf8 setA
#34 = Utf8 (I)V
#35 = Utf8 var1
#36 = Utf8 getC
#37 = Utf8 ()Ljava/util/Map;
#38 = Utf8 ()Ljava/util/Map<TK;TV;>;
#39 = Utf8 setC
#40 = Utf8 (Ljava/util/Map;)V
#41 = Utf8 (Ljava/util/Map<TK;TV;>;)V
#42 = Utf8 <init>
#43 = Utf8 ()V
#44 = Utf8 iterator2
#45 = Utf8 (Ljava/lang/Object;Ljava/lang/Object;)Ljava/util/Iterator;
#46 = Utf8 Ljava/lang/Object;
#47 = Utf8 var2
#48 = Utf8 TK;
#49 = Utf8 TV;
#50 = Utf8 (TK;TV;)Ljava/util/Iterator;
#51 = Utf8 iterator
#52 = Utf8 ()Ljava/util/Iterator;
#53 = Utf8 ()Ljava/util/Iterator<TK;>;
#54 = Utf8 compareTo
#55 = Utf8 (Ljava/lang/Integer;)Ljava/lang/Integer;
#56 = Utf8 Ljava/lang/Integer;
#57 = Utf8 (Ljava/lang/Object;)Ljava/lang/Object;
#58 = Utf8 (TV;)TK;
#59 = Utf8 get
#60 = Utf8 ()Ljava/util/List;
#61 = Utf8 Ljava/util/ArrayList;
#62 = Utf8 ()Ljava/util/List<Ljava/io/File;>;
#63 = Utf8 main
#64 = Utf8 ([Ljava/lang/String;)V
#65 = Utf8 var0
#66 = Utf8 [Ljava/lang/String;
#67 = Utf8 print
#68 = Utf8 <K:Ljava/lang/Object;V:Ljava/lang/Object;>Ljava/util/LinkedHashMap<TK;TV;>;Ljava/lang/Iterable<TK;>;
#69 = Utf8 SourceFile
#70 = Utf8 Abc.java
#71 = NameAndType #13:#14 // a:I
#72 = NameAndType #20:#21 // c:Ljava/util/Map;
#73 = NameAndType #42:#43 // "<init>":()V
#74 = Utf8 java/util/ArrayList
#75 = Class #84 // java/lang/System
#76 = NameAndType #85:#86 // out:Ljava/io/PrintStream;
#77 = Utf8 Hello Main!
#78 = Class #87 // java/io/PrintStream
#79 = NameAndType #88:#89 // println:(Ljava/lang/String;)V
#80 = Utf8 Hello ASM!
#81 = Utf8 com/coding/asm/test/Abc
#82 = Utf8 java/util/LinkedHashMap
#83 = Utf8 java/lang/Iterable
#84 = Utf8 java/lang/System
#85 = Utf8 out
#86 = Utf8 Ljava/io/PrintStream;
#87 = Utf8 java/io/PrintStream
#88 = Utf8 println
#89 = Utf8 (Ljava/lang/String;)V
{
public int getA();
descriptor: ()I
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=1, args_size=1
0: aload_0
1: pop
2: getstatic #1 // Field a:I
5: ireturn
LineNumberTable:
line 15: 0
LocalVariableTable:
Start Length Slot Name Signature
0 6 0 this Lcom/coding/asm/test/Abc;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 6 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
public void setA(int);
descriptor: (I)V
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=2, args_size=2
0: aload_0
1: pop
2: iload_1
3: putstatic #1 // Field a:I
6: return
LineNumberTable:
line 19: 0
line 20: 6
LocalVariableTable:
Start Length Slot Name Signature
0 7 0 this Lcom/coding/asm/test/Abc;
0 7 1 var1 I
LocalVariableTypeTable:
Start Length Slot Name Signature
0 7 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
public java.util.Map<K, V> getC();
descriptor: ()Ljava/util/Map;
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=1, args_size=1
0: aload_0
1: getfield #2 // Field c:Ljava/util/Map;
4: areturn
LineNumberTable:
line 23: 0
LocalVariableTable:
Start Length Slot Name Signature
0 5 0 this Lcom/coding/asm/test/Abc;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 5 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
Signature: #38 // ()Ljava/util/Map<TK;TV;>;
public void setC(java.util.Map<K, V>);
descriptor: (Ljava/util/Map;)V
flags: (0x0001) ACC_PUBLIC
Code:
stack=2, locals=2, args_size=2
0: aload_0
1: aload_1
2: putfield #2 // Field c:Ljava/util/Map;
5: return
LineNumberTable:
line 27: 0
line 28: 5
LocalVariableTable:
Start Length Slot Name Signature
0 6 0 this Lcom/coding/asm/test/Abc;
0 6 1 var1 Ljava/util/Map;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 6 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
0 6 1 var1 Ljava/util/Map<TK;TV;>;
Signature: #41 // (Ljava/util/Map<TK;TV;>;)V
public com.coding.asm.test.Abc();
descriptor: ()V
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=1, args_size=1
0: aload_0
1: invokespecial #3 // Method java/util/LinkedHashMap."<init>":()V
4: return
LineNumberTable:
line 30: 0
line 31: 4
LocalVariableTable:
Start Length Slot Name Signature
0 5 0 this Lcom/coding/asm/test/Abc;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 5 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
public java.util.Iterator iterator2(K, V);
descriptor: (Ljava/lang/Object;Ljava/lang/Object;)Ljava/util/Iterator;
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=3, args_size=3
0: aconst_null
1: areturn
LineNumberTable:
line 34: 0
LocalVariableTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc;
0 2 1 var1 Ljava/lang/Object;
0 2 2 var2 Ljava/lang/Object;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
0 2 1 var1 TK;
0 2 2 var2 TV;
Signature: #50 // (TK;TV;)Ljava/util/Iterator;
public java.util.Iterator<K> iterator();
descriptor: ()Ljava/util/Iterator;
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=1, args_size=1
0: aconst_null
1: areturn
LineNumberTable:
line 38: 0
LocalVariableTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
Signature: #53 // ()Ljava/util/Iterator<TK;>;
public java.lang.Integer compareTo(java.lang.Integer);
descriptor: (Ljava/lang/Integer;)Ljava/lang/Integer;
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=2, args_size=2
0: aload_1
1: areturn
LineNumberTable:
line 42: 0
LocalVariableTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc;
0 2 1 var1 Ljava/lang/Integer;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
public K getA(V);
descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=2, args_size=2
0: aconst_null
1: areturn
LineNumberTable:
line 46: 0
LocalVariableTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc;
0 2 1 var1 Ljava/lang/Object;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
0 2 1 var1 TV;
Signature: #58 // (TV;)TK;
public java.util.List<java.io.File> get();
descriptor: ()Ljava/util/List;
flags: (0x0001) ACC_PUBLIC
Code:
stack=2, locals=2, args_size=1
0: new #4 // class java/util/ArrayList
3: dup
4: invokespecial #5 // Method java/util/ArrayList."<init>":()V
7: astore_1
8: aload_1
9: areturn
LineNumberTable:
line 50: 0
line 51: 8
LocalVariableTable:
Start Length Slot Name Signature
0 10 0 this Lcom/coding/asm/test/Abc;
8 2 1 var1 Ljava/util/ArrayList;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 10 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
Signature: #62 // ()Ljava/util/List<Ljava/io/File;>;
public static void main(java.lang.String[]);
descriptor: ([Ljava/lang/String;)V
flags: (0x0009) ACC_PUBLIC, ACC_STATIC
Code:
stack=2, locals=1, args_size=1
0: getstatic #6 // Field java/lang/System.out:Ljava/io/PrintStream;
3: ldc #7 // String Hello Main!
5: invokevirtual #8 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
8: return
LineNumberTable:
line 55: 0
line 56: 8
LocalVariableTable:
Start Length Slot Name Signature
0 9 0 var0 [Ljava/lang/String;
public void print();
descriptor: ()V
flags: (0x0001) ACC_PUBLIC
Code:
stack=2, locals=1, args_size=1
0: getstatic #6 // Field java/lang/System.out:Ljava/io/PrintStream;
3: ldc #9 // String Hello ASM!
5: invokevirtual #8 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
8: return
LineNumberTable:
line 59: 0
line 60: 8
LocalVariableTable:
Start Length Slot Name Signature
0 9 0 this Lcom/coding/asm/test/Abc;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 9 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
}
Signature: #68 // <K:Ljava/lang/Object;V:Ljava/lang/Object;>Ljava/util/LinkedHashMap<TK;TV;>;Ljava/lang/Iterable<TK;>;
SourceFile: "Abc.java"
javap -p ./Abc.class 显示所有类和成员
Compiled from "Abc.java"
public class com.coding.asm.test.Abc<K, V> extends java.util.LinkedHashMap<K, V> implements java.lang.Iterable<K> {
private static int a;
private static final double b;
private java.util.Map<K, V> c;
public int getA();
public void setA(int);
public java.util.Map<K, V> getC();
public void setC(java.util.Map<K, V>);
public com.coding.asm.test.Abc();
public java.util.Iterator iterator2(K, V);
public java.util.Iterator<K> iterator();
public java.lang.Integer compareTo(java.lang.Integer);
public K getA(V);
public java.util.List<java.io.File> get();
public static void main(java.lang.String[]);
public void print();
}
javap -public ./Abc.class 显示类的public成员
Compiled from "Abc.java"
public class com.coding.asm.test.Abc<K, V> extends java.util.LinkedHashMap<K, V> implements java.lang.Iterable<K> {
public int getA();
public void setA(int);
public java.util.Map<K, V> getC();
public void setC(java.util.Map<K, V>);
public com.coding.asm.test.Abc();
public java.util.Iterator iterator2(K, V);
public java.util.Iterator<K> iterator();
public java.lang.Integer compareTo(java.lang.Integer);
public K getA(V);
public java.util.List<java.io.File> get();
public static void main(java.lang.String[]);
public void print();
}
javap -protected 显示受保护的/公共的 类和成员
Compiled from "Abc.java"
public class com.coding.asm.test.Abc<K, V> extends java.util.LinkedHashMap<K, V> implements java.lang.Iterable<K> {
public int getA();
public void setA(int);
public java.util.Map<K, V> getC();
public void setC(java.util.Map<K, V>);
public com.coding.asm.test.Abc();
public java.util.Iterator iterator2(K, V);
public java.util.Iterator<K> iterator();
public java.lang.Integer compareTo(java.lang.Integer);
public K getA(V);
public java.util.List<java.io.File> get();
public static void main(java.lang.String[]);
public void print();
}
显示类所有可访问修饰符范围大于protected的成员
javap -l ./Abc.class 输出行号和本地变量表
Compiled from "Abc.java"
public class com.coding.asm.test.Abc<K, V> extends java.util.LinkedHashMap<K, V> implements java.lang.Iterable<K> {
public int getA();
LineNumberTable:
line 15: 0
LocalVariableTable:
Start Length Slot Name Signature
0 6 0 this Lcom/coding/asm/test/Abc;
public void setA(int);
LineNumberTable:
line 19: 0
line 20: 6
LocalVariableTable:
Start Length Slot Name Signature
0 7 0 this Lcom/coding/asm/test/Abc;
0 7 1 var1 I
public java.util.Map<K, V> getC();
LineNumberTable:
line 23: 0
LocalVariableTable:
Start Length Slot Name Signature
0 5 0 this Lcom/coding/asm/test/Abc;
public void setC(java.util.Map<K, V>);
LineNumberTable:
line 27: 0
line 28: 5
LocalVariableTable:
Start Length Slot Name Signature
0 6 0 this Lcom/coding/asm/test/Abc;
0 6 1 var1 Ljava/util/Map;
public com.coding.asm.test.Abc();
LineNumberTable:
line 30: 0
line 31: 4
LocalVariableTable:
Start Length Slot Name Signature
0 5 0 this Lcom/coding/asm/test/Abc;
public java.util.Iterator iterator2(K, V);
LineNumberTable:
line 34: 0
LocalVariableTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc;
0 2 1 var1 Ljava/lang/Object;
0 2 2 var2 Ljava/lang/Object;
public java.util.Iterator<K> iterator();
LineNumberTable:
line 38: 0
LocalVariableTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc;
public java.lang.Integer compareTo(java.lang.Integer);
LineNumberTable:
line 42: 0
LocalVariableTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc;
0 2 1 var1 Ljava/lang/Integer;
public K getA(V);
LineNumberTable:
line 46: 0
LocalVariableTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc;
0 2 1 var1 Ljava/lang/Object;
public java.util.List<java.io.File> get();
LineNumberTable:
line 50: 0
line 51: 8
LocalVariableTable:
Start Length Slot Name Signature
0 10 0 this Lcom/coding/asm/test/Abc;
8 2 1 var1 Ljava/util/ArrayList;
public static void main(java.lang.String[]);
LineNumberTable:
line 55: 0
line 56: 8
LocalVariableTable:
Start Length Slot Name Signature
0 9 0 var0 [Ljava/lang/String;
public void print();
LineNumberTable:
line 59: 0
line 60: 8
LocalVariableTable:
Start Length Slot Name Signature
0 9 0 this Lcom/coding/asm/test/Abc;
}
javap -package ./Abc.class 显示程序包/受保护的/公共类
Compiled from "Abc.java"
public class com.coding.asm.test.Abc<K, V> extends java.util.LinkedHashMap<K, V> implements java.lang.Iterable<K> {
public int getA();
public void setA(int);
public java.util.Map<K, V> getC();
public void setC(java.util.Map<K, V>);
public com.coding.asm.test.Abc();
public java.util.Iterator iterator2(K, V);
public java.util.Iterator<K> iterator();
public java.lang.Integer compareTo(java.lang.Integer);
public K getA(V);
public java.util.List<java.io.File> get();
public static void main(java.lang.String[]);
public void print();
}
javap -v/javap -p -v 输出附加信息
Classfile /Users/micocube/Documents/Utils4j/target/classes/com/coding/asm/test/Abc.class
Last modified Jan 15, 2019; size 2532 bytes
MD5 checksum 99abe1aa8dc262de3a2717383298195c
Compiled from "Abc.java"
public class com.coding.asm.test.Abc<K extends java.lang.Object, V extends java.lang.Object> extends java.util.LinkedHashMap<K, V> implements java.lang.Iterable<K>
minor version: 0
major version: 52
flags: (0x0021) ACC_PUBLIC, ACC_SUPER
this_class: #10 // com/coding/asm/test/Abc
super_class: #11 // java/util/LinkedHashMap
interfaces: 1, fields: 3, methods: 12, attributes: 2
Constant pool:
#1 = Fieldref #10.#71 // com/coding/asm/test/Abc.a:I
#2 = Fieldref #10.#72 // com/coding/asm/test/Abc.c:Ljava/util/Map;
#3 = Methodref #11.#73 // java/util/LinkedHashMap."<init>":()V
#4 = Class #74 // java/util/ArrayList
#5 = Methodref #4.#73 // java/util/ArrayList."<init>":()V
#6 = Fieldref #75.#76 // java/lang/System.out:Ljava/io/PrintStream;
#7 = String #77 // Hello Main!
#8 = Methodref #78.#79 // java/io/PrintStream.println:(Ljava/lang/String;)V
#9 = String #80 // Hello ASM!
#10 = Class #81 // com/coding/asm/test/Abc
#11 = Class #82 // java/util/LinkedHashMap
#12 = Class #83 // java/lang/Iterable
#13 = Utf8 a
#14 = Utf8 I
#15 = Utf8 b
#16 = Utf8 D
#17 = Utf8 ConstantValue
#18 = Double 1000.01d
#20 = Utf8 c
#21 = Utf8 Ljava/util/Map;
#22 = Utf8 Signature
#23 = Utf8 Ljava/util/Map<TK;TV;>;
#24 = Utf8 getA
#25 = Utf8 ()I
#26 = Utf8 Code
#27 = Utf8 LineNumberTable
#28 = Utf8 LocalVariableTable
#29 = Utf8 this
#30 = Utf8 Lcom/coding/asm/test/Abc;
#31 = Utf8 LocalVariableTypeTable
#32 = Utf8 Lcom/coding/asm/test/Abc<TK;TV;>;
#33 = Utf8 setA
#34 = Utf8 (I)V
#35 = Utf8 var1
#36 = Utf8 getC
#37 = Utf8 ()Ljava/util/Map;
#38 = Utf8 ()Ljava/util/Map<TK;TV;>;
#39 = Utf8 setC
#40 = Utf8 (Ljava/util/Map;)V
#41 = Utf8 (Ljava/util/Map<TK;TV;>;)V
#42 = Utf8 <init>
#43 = Utf8 ()V
#44 = Utf8 iterator2
#45 = Utf8 (Ljava/lang/Object;Ljava/lang/Object;)Ljava/util/Iterator;
#46 = Utf8 Ljava/lang/Object;
#47 = Utf8 var2
#48 = Utf8 TK;
#49 = Utf8 TV;
#50 = Utf8 (TK;TV;)Ljava/util/Iterator;
#51 = Utf8 iterator
#52 = Utf8 ()Ljava/util/Iterator;
#53 = Utf8 ()Ljava/util/Iterator<TK;>;
#54 = Utf8 compareTo
#55 = Utf8 (Ljava/lang/Integer;)Ljava/lang/Integer;
#56 = Utf8 Ljava/lang/Integer;
#57 = Utf8 (Ljava/lang/Object;)Ljava/lang/Object;
#58 = Utf8 (TV;)TK;
#59 = Utf8 get
#60 = Utf8 ()Ljava/util/List;
#61 = Utf8 Ljava/util/ArrayList;
#62 = Utf8 ()Ljava/util/List<Ljava/io/File;>;
#63 = Utf8 main
#64 = Utf8 ([Ljava/lang/String;)V
#65 = Utf8 var0
#66 = Utf8 [Ljava/lang/String;
#67 = Utf8 print
#68 = Utf8 <K:Ljava/lang/Object;V:Ljava/lang/Object;>Ljava/util/LinkedHashMap<TK;TV;>;Ljava/lang/Iterable<TK;>;
#69 = Utf8 SourceFile
#70 = Utf8 Abc.java
#71 = NameAndType #13:#14 // a:I
#72 = NameAndType #20:#21 // c:Ljava/util/Map;
#73 = NameAndType #42:#43 // "<init>":()V
#74 = Utf8 java/util/ArrayList
#75 = Class #84 // java/lang/System
#76 = NameAndType #85:#86 // out:Ljava/io/PrintStream;
#77 = Utf8 Hello Main!
#78 = Class #87 // java/io/PrintStream
#79 = NameAndType #88:#89 // println:(Ljava/lang/String;)V
#80 = Utf8 Hello ASM!
#81 = Utf8 com/coding/asm/test/Abc
#82 = Utf8 java/util/LinkedHashMap
#83 = Utf8 java/lang/Iterable
#84 = Utf8 java/lang/System
#85 = Utf8 out
#86 = Utf8 Ljava/io/PrintStream;
#87 = Utf8 java/io/PrintStream
#88 = Utf8 println
#89 = Utf8 (Ljava/lang/String;)V
{
private static int a;
descriptor: I
flags: (0x000a) ACC_PRIVATE, ACC_STATIC
private static final double b;
descriptor: D
flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
ConstantValue: double 1000.01d
private java.util.Map<K, V> c;
descriptor: Ljava/util/Map;
flags: (0x0002) ACC_PRIVATE
Signature: #23 // Ljava/util/Map<TK;TV;>;
public int getA();
descriptor: ()I
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=1, args_size=1
0: aload_0
1: pop
2: getstatic #1 // Field a:I
5: ireturn
LineNumberTable:
line 15: 0
LocalVariableTable:
Start Length Slot Name Signature
0 6 0 this Lcom/coding/asm/test/Abc;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 6 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
public void setA(int);
descriptor: (I)V
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=2, args_size=2
0: aload_0
1: pop
2: iload_1
3: putstatic #1 // Field a:I
6: return
LineNumberTable:
line 19: 0
line 20: 6
LocalVariableTable:
Start Length Slot Name Signature
0 7 0 this Lcom/coding/asm/test/Abc;
0 7 1 var1 I
LocalVariableTypeTable:
Start Length Slot Name Signature
0 7 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
public java.util.Map<K, V> getC();
descriptor: ()Ljava/util/Map;
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=1, args_size=1
0: aload_0
1: getfield #2 // Field c:Ljava/util/Map;
4: areturn
LineNumberTable:
line 23: 0
LocalVariableTable:
Start Length Slot Name Signature
0 5 0 this Lcom/coding/asm/test/Abc;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 5 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
Signature: #38 // ()Ljava/util/Map<TK;TV;>;
public void setC(java.util.Map<K, V>);
descriptor: (Ljava/util/Map;)V
flags: (0x0001) ACC_PUBLIC
Code:
stack=2, locals=2, args_size=2
0: aload_0
1: aload_1
2: putfield #2 // Field c:Ljava/util/Map;
5: return
LineNumberTable:
line 27: 0
line 28: 5
LocalVariableTable:
Start Length Slot Name Signature
0 6 0 this Lcom/coding/asm/test/Abc;
0 6 1 var1 Ljava/util/Map;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 6 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
0 6 1 var1 Ljava/util/Map<TK;TV;>;
Signature: #41 // (Ljava/util/Map<TK;TV;>;)V
public com.coding.asm.test.Abc();
descriptor: ()V
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=1, args_size=1
0: aload_0
1: invokespecial #3 // Method java/util/LinkedHashMap."<init>":()V
4: return
LineNumberTable:
line 30: 0
line 31: 4
LocalVariableTable:
Start Length Slot Name Signature
0 5 0 this Lcom/coding/asm/test/Abc;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 5 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
public java.util.Iterator iterator2(K, V);
descriptor: (Ljava/lang/Object;Ljava/lang/Object;)Ljava/util/Iterator;
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=3, args_size=3
0: aconst_null
1: areturn
LineNumberTable:
line 34: 0
LocalVariableTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc;
0 2 1 var1 Ljava/lang/Object;
0 2 2 var2 Ljava/lang/Object;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
0 2 1 var1 TK;
0 2 2 var2 TV;
Signature: #50 // (TK;TV;)Ljava/util/Iterator;
public java.util.Iterator<K> iterator();
descriptor: ()Ljava/util/Iterator;
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=1, args_size=1
0: aconst_null
1: areturn
LineNumberTable:
line 38: 0
LocalVariableTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
Signature: #53 // ()Ljava/util/Iterator<TK;>;
public java.lang.Integer compareTo(java.lang.Integer);
descriptor: (Ljava/lang/Integer;)Ljava/lang/Integer;
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=2, args_size=2
0: aload_1
1: areturn
LineNumberTable:
line 42: 0
LocalVariableTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc;
0 2 1 var1 Ljava/lang/Integer;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
public K getA(V);
descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
flags: (0x0001) ACC_PUBLIC
Code:
stack=1, locals=2, args_size=2
0: aconst_null
1: areturn
LineNumberTable:
line 46: 0
LocalVariableTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc;
0 2 1 var1 Ljava/lang/Object;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 2 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
0 2 1 var1 TV;
Signature: #58 // (TV;)TK;
public java.util.List<java.io.File> get();
descriptor: ()Ljava/util/List;
flags: (0x0001) ACC_PUBLIC
Code:
stack=2, locals=2, args_size=1
0: new #4 // class java/util/ArrayList
3: dup
4: invokespecial #5 // Method java/util/ArrayList."<init>":()V
7: astore_1
8: aload_1
9: areturn
LineNumberTable:
line 50: 0
line 51: 8
LocalVariableTable:
Start Length Slot Name Signature
0 10 0 this Lcom/coding/asm/test/Abc;
8 2 1 var1 Ljava/util/ArrayList;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 10 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
Signature: #62 // ()Ljava/util/List<Ljava/io/File;>;
public static void main(java.lang.String[]);
descriptor: ([Ljava/lang/String;)V
flags: (0x0009) ACC_PUBLIC, ACC_STATIC
Code:
stack=2, locals=1, args_size=1
0: getstatic #6 // Field java/lang/System.out:Ljava/io/PrintStream;
3: ldc #7 // String Hello Main!
5: invokevirtual #8 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
8: return
LineNumberTable:
line 55: 0
line 56: 8
LocalVariableTable:
Start Length Slot Name Signature
0 9 0 var0 [Ljava/lang/String;
public void print();
descriptor: ()V
flags: (0x0001) ACC_PUBLIC
Code:
stack=2, locals=1, args_size=1
0: getstatic #6 // Field java/lang/System.out:Ljava/io/PrintStream;
3: ldc #9 // String Hello ASM!
5: invokevirtual #8 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
8: return
LineNumberTable:
line 59: 0
line 60: 8
LocalVariableTable:
Start Length Slot Name Signature
0 9 0 this Lcom/coding/asm/test/Abc;
LocalVariableTypeTable:
Start Length Slot Name Signature
0 9 0 this Lcom/coding/asm/test/Abc<TK;TV;>;
}
Signature: #68 // <K:Ljava/lang/Object;V:Ljava/lang/Object;>Ljava/util/LinkedHashMap<TK;TV;>;Ljava/lang/Iterable<TK;>;
SourceFile: "Abc.java"
javap -c 反汇编
Compiled from "Abc.java"
public class com.coding.asm.test.Abc<K, V> extends java.util.LinkedHashMap<K, V> implements java.lang.Iterable<K> {
public int getA();
Code:
0: aload_0
1: pop
2: getstatic #1 // Field a:I
5: ireturn
public void setA(int);
Code:
0: aload_0
1: pop
2: iload_1
3: putstatic #1 // Field a:I
6: return
public java.util.Map<K, V> getC();
Code:
0: aload_0
1: getfield #2 // Field c:Ljava/util/Map;
4: areturn
public void setC(java.util.Map<K, V>);
Code:
0: aload_0
1: aload_1
2: putfield #2 // Field c:Ljava/util/Map;
5: return
public com.coding.asm.test.Abc();
Code:
0: aload_0
1: invokespecial #3 // Method java/util/LinkedHashMap."<init>":()V
4: return
public java.util.Iterator iterator2(K, V);
Code:
0: aconst_null
1: areturn
public java.util.Iterator<K> iterator();
Code:
0: aconst_null
1: areturn
public java.lang.Integer compareTo(java.lang.Integer);
Code:
0: aload_1
1: areturn
public K getA(V);
Code:
0: aconst_null
1: areturn
public java.util.List<java.io.File> get();
Code:
0: new #4 // class java/util/ArrayList
3: dup
4: invokespecial #5 // Method java/util/ArrayList."<init>":()V
7: astore_1
8: aload_1
9: areturn
public static void main(java.lang.String[]);
Code:
0: getstatic #6 // Field java/lang/System.out:Ljava/io/PrintStream;
3: ldc #7 // String Hello Main!
5: invokevirtual #8 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
8: return
public void print();
Code:
0: getstatic #6 // Field java/lang/System.out:Ljava/io/PrintStream;
3: ldc #9 // String Hello ASM!
5: invokevirtual #8 // Method java/io/PrintStream.println:(Ljava/lang/String;)V
8: return
}
其实，javap -c 输出内部javap -v中已经有了
javap -s/javap -p -s ./Abc.class 输出内部类型签名
Compiled from "Abc.java"
public class com.coding.asm.test.Abc<K, V> extends java.util.LinkedHashMap<K, V> implements java.lang.Iterable<K> {
public int getA();
descriptor: ()I
public void setA(int);
descriptor: (I)V
public java.util.Map<K, V> getC();
descriptor: ()Ljava/util/Map;
public void setC(java.util.Map<K, V>);
descriptor: (Ljava/util/Map;)V
public com.coding.asm.test.Abc();
descriptor: ()V
public java.util.Iterator iterator2(K, V);
descriptor: (Ljava/lang/Object;Ljava/lang/Object;)Ljava/util/Iterator;
public java.util.Iterator<K> iterator();
descriptor: ()Ljava/util/Iterator;
public java.lang.Integer compareTo(java.lang.Integer);
descriptor: (Ljava/lang/Integer;)Ljava/lang/Integer;
public K getA(V);
descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
public java.util.List<java.io.File> get();
descriptor: ()Ljava/util/List;
public static void main(java.lang.String[]);
descriptor: ([Ljava/lang/String;)V
public void print();
descriptor: ()V
}
javap -sysinfo/javap -p -sysinfo ./Abc.class 显示正在处理的类的系统信息 (路径, 大小, 日期, MD5 散列)
Classfile /Users/micocube/Documents/Utils4j/target/classes/com/coding/asm/test/Abc.class
Last modified Jan 15, 2019; size 2532 bytes
MD5 checksum 99abe1aa8dc262de3a2717383298195c
Compiled from "Abc.java"
public class com.coding.asm.test.Abc<K, V> extends java.util.LinkedHashMap<K, V> implements java.lang.Iterable<K> {
public int getA();
public void setA(int);
public java.util.Map<K, V> getC();
public void setC(java.util.Map<K, V>);
public com.coding.asm.test.Abc();
public java.util.Iterator iterator2(K, V);
public java.util.Iterator<K> iterator();
public java.lang.Integer compareTo(java.lang.Integer);
public K getA(V);
public java.util.List<java.io.File> get();
public static void main(java.lang.String[]);
public void print();
}
javap -constants/-p -constants ./Abc.class 显示最终常量
C:\Users\user\Desktop>javap -constants JavapTest.class
Compiled from "JavapTest.java"
public class com.method.handler.JavapTest {
public static final int _P_2 = 2;
public com.method.handler.JavapTest();
public static void main(java.lang.String[]);
}
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