java 自定义注解class_Java自定义注解

package com.what21.jdk15.demo02;

import java.lang.annotation.Documented;

import java.lang.annotation.Inherited;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

@Retention(RetentionPolicy.RUNTIME)

@Documented

@Inherited

public @interface Property {

/**

* 默认值为""

*

* @return

*/

String name() default "";

/**

* 默认值为""

*

* @return

*/

String value() default "";

}

package com.what21.jdk15.demo02;

import java.lang.annotation.Annotation;

@Property(name = "class")

public class AnnotationDemo {

@Property(name = "field", value = "test")

public String test;

@Property(name = "method", value = "test")

public static void test() {

System.out.println("test()");

}

/**

* @param args

* @throws Exception

*/

public static void main(String[] args) throws Exception {

// ========获取类的注解========

Annotation classAno = AnnotationDemo.class

.getAnnotation(Property.class);

System.out.println(classAno);

// ========获取字段的注解========

Annotation fieldAno = AnnotationDemo.class.getField("test")

.getAnnotation(Property.class);

System.out.println(fieldAno);

// ========获取方法的注解========

Annotation methodAno = AnnotationDemo.class.getMethod("test")

.getAnnotation(Property.class);

System.out.println(methodAno);

}

}