为注解增加属性

package com.howlaa.day04;

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

@Retention(RetentionPolicy.RUNTIME)
public @interface WfAnnotation {
	 String color() default "blue";
	 String value();
	 int[] arrayAttr() default {3,4,5};
}

注意格式。

package com.howlaa.day04;

@WfAnnotation(color="red",value="abc",arrayAttr={1,2})
public class AnnotationTest {
	@WfAnnotation("xyz")
	public static void main(String[] args) {
		if(AnnotationTest.class.isAnnotationPresent(WfAnnotation.class)){
			WfAnnotation annotation = (WfAnnotation)AnnotationTest.class.getAnnotation(WfAnnotation.class);
			System.out.println(annotation.color());
			System.out.println(annotation.value());
			System.out.println(annotation.arrayAttr().length);	
		}
	}
}

输出：

red
abc
2