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为什么注释没有保留在类文件[duplicate]中

java-annotations java

-1

user79074 · 技术社区 · 6 年前

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface MyAnnot {
    public String value();
}

@MyAnnot("somevalue")
public interface MyClass
{
}

如果我运行以下命令:

爪哇语我的类.java

爪哇语MyClass.class类

那么我的输出是:

公共接口MyClass{}

2 回复 | 直到 5 年前

Savior 6 年前

使用 -v -verbose

> javap -c -v MyClass.class 

[...]

SourceFile: "MyClass.java"
RuntimeVisibleAnnotations:
  0: #24(#25=s#26)
    org.example.MyAnnot(
      value="somevalue"
    )

-1

Steaton 6 年前

C:\Development\stack>javap -v MyClass.class
Classfile /C:/Development/stack/MyClass.class
  Last modified 12-Sep-2018; size 172 bytes
  MD5 checksum 9ca4a6c712dadb0bedeede816c57c1b4
  Compiled from "MyClass.java"
public interface MyClass
  minor version: 0
  major version: 52
  flags: ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
Constant pool:
   #1 = Class              #9             // MyClass
   #2 = Class              #10            // java/lang/Object
   #3 = Utf8               SourceFile
   #4 = Utf8               MyClass.java
   #5 = Utf8               RuntimeVisibleAnnotations
   #6 = Utf8               LMyAnnot;
   #7 = Utf8               value
   #8 = Utf8               somevalue
   #9 = Utf8               MyClass
  #10 = Utf8               java/lang/Object
{
}
SourceFile: "MyClass.java"
RuntimeVisibleAnnotations:
  0: #6(#7=s#8)