java注解

使用

定义注解

public class MyAnnotation {
    @Retention(RetentionPolicy.RUNTIME)  
    @Target(ElementType.METHOD)  
    public @interface Person {  
        String name();  
    }   
}

使用注解

public class Main { 
    @Person(name = "123")
    public void print(){
        
    }
    
    public static void main(String[] args) {
        
        Class cl = Main.class;
        try {
            Method m = cl.getMethod("print",new Class[]{});
            Person p = m.getAnnotation(Person.class);
            System.out.println(p.name());
        } catch (NoSuchMethodException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }

}

反编译

反编译MyAnnotation.class

public class MyAnnotation
{
    public static interface Person
        extends Annotation
    {

        public abstract String name();
    }


    public MyAnnotation()
    {
    }
}

反编译注解MyAnnotation$Person.class

public static interface MyAnnotation$Person
    extends Annotation
{

    public abstract String name();
}