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Learning Java Lambdas

You're reading from  Learning Java Lambdas

Product type Book
Published in Mar 2017
Publisher
ISBN-13 9781787282087
Pages 114 pages
Edition 1st Edition
Languages
Author (1):
Toby Weston Toby Weston
Profile icon Toby Weston
Toc

Example 4


package jdk8.byte_code;

import static jdk8.byte_code.Server.HttpServer;
import static jdk8.byte_code.WaitFor.waitFor;

public class Example4 {
    // lambda with arguments
    void example() throws InterruptedException {
        waitFor(new HttpServer(), (server) -> server.isRunning());
    }
}
Classfile Example4.class
   Last modified 08-May-2014; size 1414 bytes
   MD5 checksum 7177f97fdf30b0648a09ab98109a479c
   Compiled from "Example4.java"
 public class jdk8.byte_code.Example4
   SourceFile: "Example4.java"
   InnerClasses:
     public static #21= #2 of #29; //HttpServer=class jdk8/byte_code/Server$HttpServer of class jdk8/byte_code/Server 
     public static final #65= #64 of #67; //Lookup=class java/lang/invoke/MethodHandles$Lookup of class java/lang/invoke/MethodHandles 
  BootstrapMethods:
    0: #32 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
 Method arguments:
   #33 (Ljava/lang/Object;)Z
   #34 invokestatic jdk8/byte_code/Example4.lambda$example33 : (L
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rHttpServer;)Z
   #35 (Ljdk8/byte_code/Server$HttpServer;)Z
 minor version: 0
 major version: 52
 flags: ACC_PUBLIC, ACC_SUPER
 Constant pool:
 #1 = Methodref         #9.#28     //java/lang/Object."<init>":()V    
 #2 = Class             #30        //jdk8/byte_code/Server$HttpServer   
 #3 = Methodref         #2.#28     //jdk8/byte_code/Server$HttpServer."<init>":()V 
 #4 = InvokeDynamic     #0:#36     // #0:test:()Ljava/util/function/Predicate;   
 #5 = Methodref         #37.#38    // jdk8/byte_code/WaitFor.waitFor:(Ljava/lang/Object;Ljava/util/function/Predicate;)V 
 #6 = Methodref         #2.#39    // jdk8/byte_code/Server$HttpServer.isRunning:()Ljava/lang/Boolean;
 #7 = Methodref         #40.#41   // java/lang/Boolean.booleanValue:()Z   
 #8 = Class             #42       // jdk8/byte_code/Example4 
 #9 = Class             #43       //java/lang/Object 
 #10 = Utf8             <init>
 #11 = Utf8             ()V 
 #12 = Utf8             Code 
 #13 = Utf8             LineNumberTable 
 #14 = Utf8             LocalVariableTable 
 #15 = Utf8             this 
 #16 = Utf8             Ljdk8/byte_code/Example4; 
 #17 = Utf8             example 
 #18 = Utf8             Exceptions 
 #19 = Class            #44       // java/lang/InterruptedException 
 #20 = Utf8             lambda$example$33 
 #21 = Utf8             HttpServer 
 #22 = Utf8             InnerClasses 
 #23 = Utf8             (Ljdk8/byte_code/Server$HttpServer;)Z 
 #24 = Utf8             server 
 #25 = Utf8             Ljdk8/byte_code/Server$HttpServer; 
#26 = Utf8              SourceFile 
#27 = Utf8              Example4.java 
#28 = NameAndType       #10:#11   // "<init>":()V 
#29 = Class             #45       // jdk8/byte_code/Server 
#30 = Utf8              jdk8/byte_code/Server$HttpServer 
#31 = Utf8              BootstrapMethods 
#32 = MethodHandle      #6:#46    // invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 
#33 = MethodType        #47       // (Ljava/lang/Object;)Z 
#34 = MethodHandle      #6:#48    // invokestatic jdk8/byte_code/Example4.lambda$example33 : (L
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#35 = MethodType        #23       // (Ljdk8/byte_code/Server$HttpServer;)Z 
#36 = NameAndType       #49:#50   // test:()Ljava/util/function/Predicate; 
#37 = Class             #51       // jdk8/byte_code/WaitFor 
#38 = NameAndType       #52:#53   // waitFor:(Ljava/lang/Object;Ljava/util/function/Predicate;)V 
#39 = NameAndType       #54:#55   // isRunning:()Ljava/lang/Boolean; 
#40 = Class             #56       // java/lang/Boolean 
#41 = NameAndType       #57:#58   // booleanValue:()Z 
#42 = Utf8              jdk8/byte_code/Example4 
#43 = Utf8              java/lang/Object 
#44 = Utf8              java/lang/InterruptedException 
#45 = Utf8              jdk8/byte_code/Server 
#46 = Methodref         #59.#60   // java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 
#47 = Utf8              (Ljava/lang/Object;)Z 
#48 = Methodref         #8.#61    // jdk8/byte_code/Example4.lambda$example33 : (L
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#49 = Utf8              test 
#50 = Utf8              ()Ljava/util/function/Predicate; 
#51 = Utf8              jdk8/byte_code/WaitFor 
#52 = Utf8              waitFor 
#53 = Utf8           (Ljava/lang/Object;Ljava/util/function/Predicate;)V 
#54 = Utf8              isRunning 
#55 = Utf8              ()Ljava/lang/Boolean; 
#56 = Utf8              java/lang/Boolean 
#57 = Utf8              booleanValue 
#58 = Utf8              ()Z 
#59 = Class             #62       // java/lang/invoke/LambdaMetafactory 
#60 = NameAndType #63:#66 // metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 
#61 = NameAndType       #20:#23   // lambda$example33 : (L
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#62 = Utf8              java/lang/invoke/LambdaMetafactory 
#63 = Utf8              metafactory 
#64 = Class             #68       // java/lang/invoke/MethodHandles$Lookup 
#65 = Utf8              Lookup 
#66 = Utf8 (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 
#67 = Class             #69       // java/lang/invoke/MethodHandles 
#68 = Utf8              java/lang/invoke/MethodHandles$Lookup 
#69 = Utf8              java/lang/invoke/MethodHandles
{
 public jdk8.byte_code.Example4();
 descriptor: ()V
 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 9: 0
 LocalVariableTable:
 Start Length Slot Name Signature
     0      5    0 this Ljdk8/byte_code/Example4;
 void example() throws java.lang.InterruptedException;
   descriptor: ()V
   flags:
   Code:
     stack=2, locals=1, args_size=1
         0: new           #2      //class jdk8/byte_code/Server$HttpServer
         3: dup
         4: invokespecial #3      //Method jdk8/byte_code/Server$HttpServer."<init>":()V
         7: invokedynamic #4,  0  //InvokeDynamic #0:test:()Ljava/util/function/Predicate;
        12: invokestatic  #5      // Method jdk8/byte_code/WaitFor.waitFor:(Ljava/lang/Object;Ljava/util/function/Predicate;)V
        15: return
      LineNumberTable:
        line 13: 0
        line 15: 15
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
            0      16     0  this   Ljdk8/byte_code/Example4;
    Exceptions:
      throws java.lang.InterruptedException
}
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