Java 自定义注解释义

标签：反射   java   注解   annotation   

package annotation;

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

//RUNTIME表示运行时Person注解也存在
//@Retention(RetentionPolicy.CLASS)
@Retention(RetentionPolicy.RUNTIME)
@interface Person {
	String name();
	int age();
}

@Person(name="Tom",age=20)
class Test1{}

@Person(name="Jack",age=22)
class Test2{}

//@Person(name="Anna",age=18)
class Test3{}

public class AnnotationTest{
	
	public static void printClassInto(Class c){
		System.out.print(c.getName()+". ");
		Person person = (Person) c.getAnnotation(Person.class);
		if (person!=null) {
			System.out.println("Person: "+person.name()+" ,age:"+person.age());
		}
		else {
			System.out.println("unknown person");
		}
	}
	
	public static void main(String[] args) {
		printClassInto(Test1.class);
		printClassInto(Test2.class);
		printClassInto(Test3.class);
	}
}

Java 自定义注解释义

标签：反射   java   注解   annotation   

原文地址：http://blog.csdn.net/wanghao109/article/details/46851849