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news 2025/9/20 21:18:27

怎么用手机创建网站,网站宣传和推广的方法有哪些,网站ui设计学的是什么,网站网站开发人员犯法吗Synthetic是人造，合成的意思，在虚拟机很多地方使用ACC_SYNTHETIC表示编译器自动生成的，区别于我们自己写的程序代码。这样说可能比较模糊，我们举个例子：我们创建一个内部类，如下 public class TestInnerCl…

Synthetic是人造，合成的意思，在虚拟机很多地方使用ACC_SYNTHETIC表示编译器自动生成的，区别于我们自己写的程序代码。这样说可能比较模糊，我们举个例子：我们创建一个内部类，如下

public class TestInnerClass {public void say(String msg) {System.out.println(msg);}class InnerClass {public void sayInner() {say("hello");}}
}

我们用javap看一下内部类InnerClass反编译之后的情况：

完整如下：

Classfile /F:/demo/mallsystem/provider/target/classes/com/mall/test/TestInnerClass$InnerClass.classLast modified 2024-11-28; size 638 bytesMD5 checksum 9f5efd7b8d0ad50545773d2a0e198f60Compiled from "TestInnerClass.java"
class com.mall.test.TestInnerClass$InnerClassminor version: 0major version: 52flags: ACC_SUPER
Constant pool:#1 = Fieldref           #5.#22         // com/mall/test/TestInnerClass$InnerClass.this$0:Lcom/mall/test/TestInnerClass;#2 = Methodref          #6.#23         // java/lang/Object."<init>":()V#3 = String             #24            // hello#4 = Methodref          #25.#26        // com/mall/test/TestInnerClass.say:(Ljava/lang/String;)V#5 = Class              #27            // com/mall/test/TestInnerClass$InnerClass#6 = Class              #28            // java/lang/Object#7 = Utf8               this$0#8 = Utf8               Lcom/mall/test/TestInnerClass;#9 = Utf8               <init>#10 = Utf8               (Lcom/mall/test/TestInnerClass;)V#11 = Utf8               Code#12 = Utf8               LineNumberTable#13 = Utf8               LocalVariableTable#14 = Utf8               this#15 = Utf8               InnerClass#16 = Utf8               InnerClasses#17 = Utf8               Lcom/mall/test/TestInnerClass$InnerClass;#18 = Utf8               sayInner#19 = Utf8               ()V#20 = Utf8               SourceFile#21 = Utf8               TestInnerClass.java#22 = NameAndType        #7:#8          // this$0:Lcom/mall/test/TestInnerClass;#23 = NameAndType        #9:#19         // "<init>":()V#24 = Utf8               hello#25 = Class              #29            // com/mall/test/TestInnerClass#26 = NameAndType        #30:#31        // say:(Ljava/lang/String;)V#27 = Utf8               com/mall/test/TestInnerClass$InnerClass#28 = Utf8               java/lang/Object#29 = Utf8               com/mall/test/TestInnerClass#30 = Utf8               say#31 = Utf8               (Ljava/lang/String;)V
{final com.mall.test.TestInnerClass this$0;descriptor: Lcom/mall/test/TestInnerClass;flags: ACC_FINAL, ACC_SYNTHETICcom.mall.test.TestInnerClass$InnerClass(com.mall.test.TestInnerClass);descriptor: (Lcom/mall/test/TestInnerClass;)Vflags:Code:stack=2, locals=2, args_size=20: aload_01: aload_12: putfield      #1                  // Field this$0:Lcom/mall/test/TestInnerClass;5: aload_06: invokespecial #2                  // Method java/lang/Object."<init>":()V9: returnLineNumberTable:line 12: 0LocalVariableTable:Start  Length  Slot  Name   Signature0      10     0  this   Lcom/mall/test/TestInnerClass$InnerClass;0      10     1 this$0   Lcom/mall/test/TestInnerClass;public void sayInner();descriptor: ()Vflags: ACC_PUBLICCode:stack=2, locals=1, args_size=10: aload_01: getfield      #1                  // Field this$0:Lcom/mall/test/TestInnerClass;4: ldc           #3                  // String hello6: invokevirtual #4                  // Method com/mall/test/TestInnerClass.say:(Ljava/lang/String;)V9: returnLineNumberTable:line 14: 0line 15: 9LocalVariableTable:Start  Length  Slot  Name   Signature0      10     0  this   Lcom/mall/test/TestInnerClass$InnerClass;
}
SourceFile: "TestInnerClass.java"
InnerClasses:#15= #5 of #25; //InnerClass=class com/mall/test/TestInnerClass$InnerClass of class com/mall/test/TestInnerClass

重点看下面标记的，ACC_SYNTHETIC标记出现了