java实训第七次作业（宠物店领养动物）

需求：升级宠物商店 -------------instanceof：判断某对象是否实现了某个接口（boolean=obj instanceof 接口）
        a，新增动物：小海豚、小鱼
        b，领养成功后，有腿的动物需要输出腿的数量

public interface Animal {
	void eat();
}

public interface Animal1 extends Animal {
	void shout();
}

 

public interface Animal2 extends Animal {
	int getLeg();
}

public class Cat implements Animal1,Animal2 {
	public void shout(){
		System.out.println("喵喵~");
	}

	public int getLeg() {
		// TODO Auto-generated method stub
		return 4;
	}

	public void eat() {
		// TODO Auto-generated method stub
		System.out.println("我吃鱼。");
	}
}

public  class Pig implements Animal1,Animal2 {
	public void shout(){
		System.out.println("哼哼~，我是小猪，");
	}

	public int getLeg() {
		// TODO Auto-generated method stub
		return 4;
	}

	public void eat() {
		// TODO Auto-generated method stub
		System.out.println("我吃饲料。");
	}
}

public class Dog implements Animal1,Animal2 {
	public void shout(){
		System.out.println("旺旺~,我是小狗，");
	}

	public int getLeg() {
		// TODO Auto-generated method stub
		return 4;
	}

	public void eat() {
		// TODO Auto-generated method stub
		System.out.println("我吃肉。");
	}
}

public class Fish implements Animal {
	public void eat() {
		// TODO Auto-generated method stub
		System.out.print("我是小鱼，我吃蚯蚓。");
	}	
}

public class Dolphin implements Animal1 {

	public void eat() {
		// TODO Auto-generated method stub
		System.out.print("我吃鱼。");
	}

	public void shout() {
		// TODO Auto-generated method stub
		System.out.print("吱吱~，我是海豚，");
	}	
}

public class Shop {
	public Animal get(int choice){
		if(choice==1){
			return new Dog();
		}else if(choice==2){
			return new Pig();
		}else if(choice==3){
			return new Cat();
		}else if(choice==4){
			return new Dolphin();	
		}else {
			return new Fish();
		}
	}

}

 测试类

import java.util.Scanner;
public class Test {
	public static void main(String[]args){
		System.out.println("请选择您要领养的小动物：\n1，小狗\n2，小猪\n3，小猫\n4，海豚\n5，鱼");
		Scanner sc=new Scanner(System.in);
		int choice=sc.nextInt();
		Shop s=new Shop();
		Animal a=s.get(choice);	
		//判断并输出。
		if((a instanceof Animal1)&&(a instanceof Animal2)){
			a.eat();
			((Animal1)a).shout();
			System.out.println("我有"+((Animal2)a).getLeg()+"条腿");
		}else if(a instanceof Animal1){
			((Animal1)a).shout();a.eat();
			System.out.println("我没有腿");
		}else{
			a.eat();
			System.out.println("我不会叫，我没有腿哦。");
	
	}
    }
}