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Learning Java Lambdas

You're reading from   Learning Java Lambdas An in-depth look at one of the most important features of modern Java

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

Example 5


package jdk8.byte_code;

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

public class Example5 {

    // closure
    void example() throws InterruptedException {
        Server server = new HttpServer();
        waitFor(() -> !server.isRunning());
    }
}
Classfile Example5.class
 Last modified 08-May-2014; size 1470 bytes
 MD5 checksum 7dd0f577d4b4b903500264acf9649c30
 Compiled from "Example5.java"
 public class jdk8.byte_code.Example5
 SourceFile: "Example5.java"
 InnerClasses:
   public static #31= #2 of #29; //HttpServer=class jdk8/byte_code/Server$HttpServer of class jdk8/byte_code/Server
   public static final #68= #67 of #70; //Lookup=class java/lang/invoke/MethodHandles$Lookup of class java/lang/invoke/MethodHandles
 BootstrapMethods:
   0: #34 invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
 Method arguments:
 #35 ()Ljava/lang/Boolean; // <-- signature and return type of the SAM method to be implemented by the lambda
 #36 invokestatic jdk8/byte_code/Example5.lambda$example$35:(Ljdk8/byte_code/Server;)Ljava/lang/Boolean;
 #35 ()Ljava/lang/Boolean; // <-- signature and return type to be enforced at invocation time
 minor version: 0
 major version: 52
 flags: ACC_PUBLIC, ACC_SUPER
 Constant pool:
 #1 = Methodref            #10.#28   //java/lang/Object."<init>":()V
 #2 = Class                #30       //jdk8/byte_code/Server$HttpServer   
 #3 = Methodref            #2.#28    // jdk8/byte_code/Server$HttpServer."<init>":()V
 #4 = InvokeDynamic        #0:#37    // #0:isSatisfied:(Ljdk8/byte_code/Server;)Ljdk8/byte_code/Condition;
 #5 = Methodref            #38.#39   // jdk8/byte_code/WaitFor.waitFor:(Ljdk8/byte_code/Condition;)V 
 #6 = InterfaceMethodref   #29.#40   // jdk8/byte_code/Server.isRunning:()Ljava/lang/Boolean;
 #7 = Methodref            #41.#42   // java/lang/Boolean.booleanValue:()Z 
 #8 = Methodref            #41.#43   // java/lang/Boolean.valueOf:(Z)Ljava/lang/Boolean; 
 #9 = Class                #44       // jdk8/byte_code/Example5 
 #10 = Class               #45       // java/lang/Object
 #11 = Utf8                <init> 
 #12 = Utf8                ()V 
 #13 = Utf8                Code 
 #14 = Utf8                LineNumberTable 
 #15 = Utf8                LocalVariableTable 
 #16 = Utf8                this 
 #17 = Utf8                Ljdk8/byte_code/Example5; 
 #18 = Utf8                example 
 #19 = Utf8                server 
 #20 = Utf8                Ljdk8/byte_code/Server; 
 #21 = Utf8                Exceptions 
 #22 = Class               #46 // java/lang/InterruptedException 
 #23 = Utf8                lambda$example$35 
 #24 = Utf8                (Ljdk8/byte_code/Server;)Ljava/lang/Boolean;   
 #25 = Utf8                StackMapTable
 #26 = Utf8                SourceFile
 #27 = Utf8                Example5.java
 #28 = NameAndType         #11:#12   // "<init>":()V 
 #29 = Class               #47       // jdk8/byte_code/Server 
 #30 = Utf8                jdk8/byte_code/Server$HttpServer
 #31 = Utf8                HttpServer 
 #32 = Utf8                InnerClasses 
 #33 = Utf8                BootstrapMethods
 #34 = MethodHandle        #6:#48    // invokestatic java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
 #35 = MethodType          #49       // ()Ljava/lang/Boolean; 
 #36 = MethodHandle        #6:#50    // invokestatic jdk8/byte_code/Example5.lambda$example$35:(Ljdk8/byte_code/Server;)Ljava/lang/Boolean; 
 #37 = NameAndType         #51:#52   // isSatisfied:(Ljdk8/byte_code/Server;)Ljdk8/byte_code/Condition; 
 #38 = Class              #53        // jdk8/byte_code/WaitFor 
 #39 = NameAndType        #54:#55    // waitFor:(Ljdk8/byte_code/Condition;)V 
 #40 = NameAndType        #56:#49    // isRunning:()Ljava/lang/Boolean; 
 #41 = Class              #57        // java/lang/Boolean 
 #42 = NameAndType        #58:#59    // booleanValue:()Z 
 #43 = NameAndType        #60:#61    // valueOf:(Z)Ljava/lang/Boolean; 
 #44 = Utf8               jdk8/byte_code/Example5 
 #45 = Utf8               java/lang/Object 
 #46 = Utf8               java/lang/InterruptedException 
 #47 = Utf8               jdk8/byte_code/Server 
 #48 = Methodref          #62.#63    // java/lang/invoke/LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 
 #49 = Utf8               ()Ljava/lang/Boolean;
 #50 = Methodref          #9.#64     // jdk8/byte_code/Example5.lambda$example$35:(Ljdk8/byte_code/Server;)Ljava/lang/Boolean;
 #51 = Utf8               isSatisfied
 #52 = Utf8          (Ljdk8/byte_code/Server;)Ljdk8/byte_code/Condition; 
 #53 = Utf8               jdk8/byte_code/WaitFor 
 #54 = Utf8               waitFor 
 #55 = Utf8               (Ljdk8/byte_code/Condition;)V
 #56 = Utf8               isRunning 
 #57 = Utf8               java/lang/Boolean
 #58 = Utf8               booleanValue 
 #59 = Utf8               ()Z 
 #60 = Utf8               valueOf
 #61 = Utf8               (Z)Ljava/lang/Boolean;
 #62 = Class              #65        // java/lang/invoke/LambdaMetafactory 
 #63 = NameAndType        #66:#69    // metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
 #64 = NameAndType        #23:#24    // lambda$example$35:(Ljdk8/byte_code/Server;)Ljava/lang/Boolean;
 #65 = Utf8               java/lang/invoke/LambdaMetafactory 
 #66 = Utf8               metafactory 
 #67 = Class              #71        // java/lang/invoke/MethodHandles$Lookup 
 #68 = Utf8               Lookup
 #69 = Utf8 (Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite; 
 #70 = Class              #72        //java/lang/invoke/MethodHandles   
 #71 = Utf8               java/lang/invoke/MethodHandles$Lookup 
 #72 = Utf8               java/lang/invoke/MethodHandles
{
  public jdk8.byte_code.Example5();
   descriptor: ()V
   flags: ACC_PUBLIC
   Code:
     stack=1, locals=1, args_size=1
       0: aload_0
       1: invokespecial #1           // Method java/lang/Object."<init>":()V 
       4: return
    LineNumberTable:
      line 6: 0
    LocalVariableTable:
      Start Length Slot Name Signature
          0      5    0 this Ljdk8/byte_code/Example5;
void example() throws java.lang.InterruptedException;
  descriptor: ()V
  flags:
  Code:
    stack=2, locals=2, 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: astore_1
       8: aload_1

       9: invokedynamic #4,  0       // InvokeDynamic #0:isSatisfied:(Ljdk8/byte_code/Server;)Ljdk8/byte_code/Condition;
       14: invokestatic  #5                  // Method jdk8/byte_code/WaitFor.waitFor:(Ljdk8/byte_code/Condition;)V
       17: return
      LineNumberTable:
        line 10: 0
        line 11: 8
        line 12: 17
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
            0      18     0  this   Ljdk8/byte_code/Example5;
            8      10     1 server   Ljdk8/byte_code/Server;
    Exceptions:
      throws java.lang.InterruptedException
}
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