面向对象第六章课后习题

package HomeWork;    //（题目一功能拓展）


interface Animal{//动物  
    void shout();  

}  

package HomeWork;


class Cat implements Animal {// 猫
public void shout() {
System.out.println("MM!");
}

}

package HomeWork;


class Dog implements Animal {// 狗
public void shout() {
System.out.println("WW!");
}

}

package HomeWork;


class Pig implements Animal{//猪  
    public void shout() {  
        System.out.println("OO!");  
    }  

}  

package HomeWork;


public class Store {  
    public static Animal get(String choice) {//返回类型为接口Animal的带参方法  
        if(choice.equalsIgnoreCase("dog")) {  
            return new Dog();  
        }else if(choice.equalsIgnoreCase("pig")) {  
            return new Pig();  
        }else {  
            return new Cat();  
        }  
    }  

}

package HomeWork;


public class Test {  
    
    public static void main(String[] args) {  
        Animal a = Store.get("pig");  
        a.shout();  
    }  
  

}  

*****************************************************************