Java注释不起作用 [英] Java Annotations not working

问题描述

我正在尝试使用 Java 注释，但似乎无法让我的代码识别出存在的注释.我究竟做错了什么?

I'm trying to use Java annotations, but can't seem to get my code to recognize that one exists. What am I doing wrong?

  import java.lang.reflect.*;
  import java.lang.annotation.*;

  @interface MyAnnotation{}


  public class FooTest
  { 
    @MyAnnotation
    public void doFoo()
    {       
    }

    public static void main(String[] args) throws Exception
    {               
        Method method = FooTest.class.getMethod( "doFoo" );

        Annotation[] annotations = method.getAnnotations();
        for( Annotation annotation : method.getAnnotations() )
            System.out.println( "Annotation: " + annotation  );

    }
  }

推荐答案

您需要使用注解界面上的@Retention 注解将注解指定为运行时注解.

You need to specify the annotation as being a Runtime annotation using the @Retention annotation on the annotation interface.

即

@Retention(RetentionPolicy.RUNTIME)
@interface MyAnnotation{}

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