Annotation的一个小问题

[java_pojo]

  package annotation;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class Test {

	@MyAnnotation(Value="aa", Mehtod = "bb")
	public void get() {
		System.out.println("Method invoked");
	}
	
	public static void main(String[] args) throws SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {
		Test t = new Test();
		Method method = t.getClass().getMethod("get");
		System.out.println(method.isAnnotationPresent(MyAnnotation.class));
		method.invoke(t);
		MyAnnotation a = method.getAnnotation(MyAnnotation.class);
		System.out.println(a);
	}
}

这个a的值是null,为什么呢? 还有System.out.println(method.isAnnotationPresent(MyAnnotation.class));这个输出是False, 是不是因为它是False才不能取到a的值.但怎么让它变成True呢.各位大侠们指较下.

[java_pojo]

被上我定义的Annotation类.

  package annotation;

public @interface MyAnnotation {

	String Mehtod();
	
	String Value();
}

[java_pojo]

哎,问题自己解决了.第一个答的人我把分送给你了

[BadPattern]

怎么解决的,我还在测试呢

[java_pojo]

我自定义的Annotation类少了个东西


package annotation;

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

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

String Mehtod();

String Value();
}

[万花丛中一点绿]

不是a.Value();a.Mehtod();吗？为嘛是a？

[BadPattern]

public enum RetentionPolicy {
  SOURCE,		// Annotation is discarded by the compiler
  CLASS,		// Annotation is stored in the class file, but ignored by the VM
  RUNTIME		// Annotation is stored in the class file and read by the VM
}

难道默认是SOURCE级别的么,这样就会被丢弃了