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caoxudong/LambdaDemo.java

Last active December 23, 2019 02:35
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lambda and method reference bytecode
Raw
lambda_and_method_reference_byetcode.markdown

java信息

➜  lambda git:(master) ✗ java -version
java version "1.8.0_102"
Java(TM) SE Runtime Environment (build 1.8.0_102-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.102-b14, mixed mode)
➜  lambda git:(master) ✗
Raw
LambdaDemo.java
package com.example.demo.lambda;
import java.io.PrintStream;
import java.util.function.Consumer;
public class LambdaDemo {
public static void main(String[] args) {
Consumer<Integer> c1 = s -> System.out.println(s);
Consumer<Integer> c2 = System.out::println;
PrintStream sysout = System.out;
Consumer<Integer> c3 = s -> sysout.println(s);
Consumer<Integer> c4 = sysout::println;
}
}
Raw
LambdaDemo.s
Classfile /Users/didi/workspace/eclipse/eclipse/demo/bin/main/com/example/demo/lambda/LambdaDemo.class
Last modified 2019-12-23; size 1769 bytes
MD5 checksum 8fb1d0b58886049412ad08924449da75
Compiled from "LambdaDemo.java"
public class com.example.demo.lambda.LambdaDemo
minor version: 0
major version: 52
flags: ACC_PUBLIC, ACC_SUPER
Constant pool:
#1 = Class #2 // com/example/demo/lambda/LambdaDemo
#2 = Utf8 com/example/demo/lambda/LambdaDemo
#3 = Class #4 // java/lang/Object
#4 = Utf8 java/lang/Object
#5 = Utf8 <init>
#6 = Utf8 ()V
#7 = Utf8 Code
#8 = Methodref #3.#9 // java/lang/Object."<init>":()V
#9 = NameAndType #5:#6 // "<init>":()V
#10 = Utf8 LineNumberTable
#11 = Utf8 LocalVariableTable
#12 = Utf8 this
#13 = Utf8 Lcom/example/demo/lambda/LambdaDemo;
#14 = Utf8 main
#15 = Utf8 ([Ljava/lang/String;)V
#16 = InvokeDynamic #0:#17 // #0:accept:()Ljava/util/function/Consumer;
#17 = NameAndType #18:#19 // accept:()Ljava/util/function/Consumer;
#18 = Utf8 accept
#19 = Utf8 ()Ljava/util/function/Consumer;
#20 = Fieldref #21.#23 // java/lang/System.out:Ljava/io/PrintStream;
#21 = Class #22 // java/lang/System
#22 = Utf8 java/lang/System
#23 = NameAndType #24:#25 // out:Ljava/io/PrintStream;
#24 = Utf8 out
#25 = Utf8 Ljava/io/PrintStream;
#26 = Methodref #3.#27 // java/lang/Object.getClass:()Ljava/lang/Class;
#27 = NameAndType #28:#29 // getClass:()Ljava/lang/Class;
#28 = Utf8 getClass
#29 = Utf8 ()Ljava/lang/Class;
#30 = InvokeDynamic #1:#31 // #1:accept:(Ljava/io/PrintStream;)Ljava/util/function/Consumer;
#31 = NameAndType #18:#32 // accept:(Ljava/io/PrintStream;)Ljava/util/function/Consumer;
#32 = Utf8 (Ljava/io/PrintStream;)Ljava/util/function/Consumer;
#33 = InvokeDynamic #2:#31 // #2:accept:(Ljava/io/PrintStream;)Ljava/util/function/Consumer;
#34 = Utf8 args
#35 = Utf8 [Ljava/lang/String;
#36 = Utf8 c1
#37 = Utf8 Ljava/util/function/Consumer;
#38 = Utf8 c2
#39 = Utf8 sysout
#40 = Utf8 c3
#41 = Utf8 c4
#42 = Utf8 LocalVariableTypeTable
#43 = Utf8 Ljava/util/function/Consumer<Ljava/lang/Integer;>;
#44 = Utf8 lambda$0
#45 = Utf8 (Ljava/lang/Integer;)V
#46 = Methodref #47.#49 // java/io/PrintStream.println:(Ljava/lang/Object;)V
#47 = Class #48 // java/io/PrintStream
#48 = Utf8 java/io/PrintStream
#49 = NameAndType #50:#51 // println:(Ljava/lang/Object;)V
#50 = Utf8 println
#51 = Utf8 (Ljava/lang/Object;)V
#52 = Utf8 s
#53 = Utf8 Ljava/lang/Integer;
#54 = Utf8 lambda$2
#55 = Utf8 (Ljava/io/PrintStream;Ljava/lang/Integer;)V
#56 = Utf8 SourceFile
#57 = Utf8 LambdaDemo.java
#58 = Utf8 BootstrapMethods
#59 = Methodref #60.#62 // java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
#60 = Class #61 // java/lang/invoke/LambdaMetafactory
#61 = Utf8 java/lang/invoke/LambdaMetafactory
#62 = NameAndType #63:#64 // metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
#63 = Utf8 metafactory
#64 = Utf8 (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
#65 = MethodHandle #6:#59 // invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
#66 = MethodType #51 // (Ljava/lang/Object;)V
#67 = Methodref #1.#68 // com/example/demo/lambda/LambdaDemo.lambda$0:(Ljava/lang/Integer;)V
#68 = NameAndType #44:#45 // lambda$0:(Ljava/lang/Integer;)V
#69 = MethodHandle #6:#67 // invokestatic com/example/demo/lambda/LambdaDemo.lambda$0:(Ljava/lang/Integer;)V
#70 = MethodType #45 // (Ljava/lang/Integer;)V
#71 = MethodType #51 // (Ljava/lang/Object;)V
#72 = MethodHandle #5:#46 // invokevirtual java/io/PrintStream.println:(Ljava/lang/Object;)V
#73 = MethodType #45 // (Ljava/lang/Integer;)V
#74 = MethodType #51 // (Ljava/lang/Object;)V
#75 = Methodref #1.#76 // com/example/demo/lambda/LambdaDemo.lambda$2:(Ljava/io/PrintStream;Ljava/lang/Integer;)V
#76 = NameAndType #54:#55 // lambda$2:(Ljava/io/PrintStream;Ljava/lang/Integer;)V
#77 = MethodHandle #6:#75 // invokestatic com/example/demo/lambda/LambdaDemo.lambda$2:(Ljava/io/PrintStream;Ljava/lang/Integer;)V
#78 = MethodType #45 // (Ljava/lang/Integer;)V
#79 = Utf8 InnerClasses
#80 = Class #81 // java/lang/invoke/MethodHandles$Lookup
#81 = Utf8 java/lang/invoke/MethodHandles$Lookup
#82 = Class #83 // java/lang/invoke/MethodHandles
#83 = Utf8 java/lang/invoke/MethodHandles
#84 = Utf8 Lookup
{
public com.example.demo.lambda.LambdaDemo();
descriptor: ()V
flags: ACC_PUBLIC
Code:
stack=1, locals=1, args_size=1
0: aload_0
1: invokespecial #8 // Method java/lang/Object."<init>":()V
4: return
LineNumberTable:
line 6: 0
LocalVariableTable:
Start Length Slot Name Signature
0 5 0 this Lcom/example/demo/lambda/LambdaDemo;
public static void main(java.lang.String[]);
descriptor: ([Ljava/lang/String;)V
flags: ACC_PUBLIC, ACC_STATIC
Code:
stack=2, locals=7, args_size=1
0: invokedynamic #16, 0 // InvokeDynamic #0:accept:()Ljava/util/function/Consumer;
5: astore_1
6: getstatic #20 // Field java/lang/System.out:Ljava/io/PrintStream;
9: dup
10: invokevirtual #26 // Method java/lang/Object.getClass:()Ljava/lang/Class;
13: pop
14: invokedynamic #30, 0 // InvokeDynamic #1:accept:(Ljava/io/PrintStream;)Ljava/util/function/Consumer;
19: astore_2
20: getstatic #20 // Field java/lang/System.out:Ljava/io/PrintStream;
23: astore 4
25: aload 4
27: invokedynamic #33, 0 // InvokeDynamic #2:accept:(Ljava/io/PrintStream;)Ljava/util/function/Consumer;
32: astore 5
34: aload 4
36: dup
37: invokevirtual #26 // Method java/lang/Object.getClass:()Ljava/lang/Class;
40: pop
41: invokedynamic #30, 0 // InvokeDynamic #1:accept:(Ljava/io/PrintStream;)Ljava/util/function/Consumer;
46: astore 6
48: return
LineNumberTable:
line 9: 0
line 10: 6
line 11: 20
line 12: 25
line 13: 34
line 14: 48
LocalVariableTable:
Start Length Slot Name Signature
0 49 0 args [Ljava/lang/String;
6 43 1 c1 Ljava/util/function/Consumer;
20 29 2 c2 Ljava/util/function/Consumer;
25 24 4 sysout Ljava/io/PrintStream;
34 15 5 c3 Ljava/util/function/Consumer;
48 1 6 c4 Ljava/util/function/Consumer;
LocalVariableTypeTable:
Start Length Slot Name Signature
6 43 1 c1 Ljava/util/function/Consumer<Ljava/lang/Integer;>;
20 29 2 c2 Ljava/util/function/Consumer<Ljava/lang/Integer;>;
34 15 5 c3 Ljava/util/function/Consumer<Ljava/lang/Integer;>;
48 1 6 c4 Ljava/util/function/Consumer<Ljava/lang/Integer;>;
private static void lambda$0(java.lang.Integer);
descriptor: (Ljava/lang/Integer;)V
flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC
Code:
stack=2, locals=1, args_size=1
0: getstatic #20 // Field java/lang/System.out:Ljava/io/PrintStream;
3: aload_0
4: invokevirtual #46 // Method java/io/PrintStream.println:(Ljava/lang/Object;)V
7: return
LineNumberTable:
line 9: 0
LocalVariableTable:
Start Length Slot Name Signature
0 8 0 s Ljava/lang/Integer;
private static void lambda$2(java.io.PrintStream, java.lang.Integer);
descriptor: (Ljava/io/PrintStream;Ljava/lang/Integer;)V
flags: ACC_PRIVATE, ACC_STATIC, ACC_SYNTHETIC
Code:
stack=2, locals=2, args_size=2
0: aload_0
1: aload_1
2: invokevirtual #46 // Method java/io/PrintStream.println:(Ljava/lang/Object;)V
5: return
LineNumberTable:
line 12: 0
LocalVariableTable:
Start Length Slot Name Signature
0 6 1 s Ljava/lang/Integer;
}
SourceFile: "LambdaDemo.java"
BootstrapMethods:
0: #65 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
Method arguments:
#66 (Ljava/lang/Object;)V
#69 invokestatic com/example/demo/lambda/LambdaDemo.lambda$0:(Ljava/lang/Integer;)V
#70 (Ljava/lang/Integer;)V
1: #65 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
Method arguments:
#71 (Ljava/lang/Object;)V
#72 invokevirtual java/io/PrintStream.println:(Ljava/lang/Object;)V
#73 (Ljava/lang/Integer;)V
2: #65 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
Method arguments:
#74 (Ljava/lang/Object;)V
#77 invokestatic com/example/demo/lambda/LambdaDemo.lambda$2:(Ljava/io/PrintStream;Ljava/lang/Integer;)V
#78 (Ljava/lang/Integer;)V
InnerClasses:
public static final #84= #80 of #82; //Lookup=class java/lang/invoke/MethodHandles$Lookup of class java/lang/invoke/MethodHandles
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