@Overrride重写在接口的继承、实现关系中的多种表现形式

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偶然一次阅读netty源码，发现@Override出现在接口类中出现，本人入道不深，第一次见这种写法，还望大神莫见怪！不多说，先贴实例代码，过程和解释再抽时间来完善。

GrandParent.java

package test;public interface GrandParent {/** * echo different things by  anyone. * @return */int echo();/** * differ on subClass or implementation class. */void start();}

Parent.java

package test;public interface Parent extends GrandParent{@Overridedefault int echo() {System.out.println("parent...");return 0;}@Overridevoid start();}

Mama.java

package test;public class Mama implements Parent{@Overridepublic void start() {System.out.println("mama start ...");}}

Papa.java

package test;public class Papa implements Parent{@Overridepublic int echo() {System.out.println("papa..");return 0;}@Overridepublic void start() {System.out.println("papa start...");}public static void main(String[] args) throws Exception {Papa papa = Papa.class.newInstance();papa.echo();papa.start();Mama mama  = Mama.class.newInstance();mama.echo();mama.start();GrandPapa gp = GrandPapa.class.newInstance();gp.echo();gp.start();}}

GrandPapa.java

package test;public class GrandPapa implements GrandParent{@Overridepublic int echo() {System.out.println("Grandpapa...");return 0;}@Overridepublic void start() {System.out.println("Grandpapa start...");}}

程序输出结果：

papa..
papa start...
parent...
mama start ...
Grandpapa...
Grandpapa start...

之后再抽时间补充解释

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