多态的典型例子

/*多态的典型例子*/
abstract class Animal{
abstract void eat();
abstract void sleep();
}


class Dog extends Animal{
void eat(){
System.out.println("猪吃饲料");
}
void sleep(){
System.out.println("猪睡觉");
}
}


class Cat extends Animal{
void eat(){
System.out.println("猫吃鱼");
}
void sleep(){
System.out.println("猫侧着睡觉");
}
}


class AnimalTool{
private AnimalTool(){}
public static void useAnimal(Animal a){
a.eat();
a.sleep();
}
}
public class DuoTaiDemo1 {


public static void main(String[] args) {
// TODO Auto-generated method stub
Animal a = new Dog();
AnimalTool.useAnimal(a);
System.out.println("---------");
Animal b = new Cat();
AnimalTool.useAnimal(b);
}
}






/*
运行结果：
猪吃饲料
猪睡觉
---------
猫吃鱼
猫侧着睡觉
*/