instance与可变参数合用，多态性

public class Doubt {

public static void main(String[] args) {

Dog d1=new Dog();

Dog d2=new Zangao();

Dog d3=new Hasiq();

Master m=new Master();

m.feed(d1,d2,d3);

}

}

class Master {

void feed(Dog ... d1) {

for(Dog d:d1) {

d.eat();

if(d instanceof Zangao) {

Zangao z=(Zangao)d;

z.fight();

System.out.println("是藏獒");

}

if(d instanceof Hasiq) {

Hasiq h=(Hasiq)d;

h.play();

System.out.println("是哈士奇");

}

}

}

}

class Dog {

void eat() {

System.out.println("狗吃东西");

}

}

class Zangao extends Dog{

void eat() {

System.out.println("藏獒吃东西");

}

void fight() {

System.out.println("我是藏獒，我爱战斗");

}

}

class Hasiq extends Dog{

void eat() {

System.out.println("哈士奇吃东西");

}

void play() {

System.out.println("我是哈士奇，我爱玩耍");

}

}