操作方法
abstract class Animal { abstract void eat(); } class Pig extends Animal { public void eat() { System.out.println("饲料"); } public static void sleep() { System.out.println("睡觉"); } } class Dog extends Animal { public void eat() { System.out.println("骨头"); } public static void Pao() { System.out.println("跑"); } } class Cat extends Animal { public void eat() { System.out.println("吃鱼"); } public static void cachmouth() { System.out.println("抓老鼠"); } }
class test { public static void main(String[] ats) { //eatfunction(new Cat()); //eatfunction(new Dog()); //eatfunction(new Pig()); //引用类型的强制转化！ //Animal a = new Dog();//类型提升！ //Dog d=(Dog)a; //d.Pao(); //d.eat(); eatfunction(new Dog()); eatfunction(new Cat()); eatfunction(new Pig()); } public static void eatfunction(Animal a) { a.eat(); if(a instanceof Cat) { Cat c=(Cat)a; c.cachmouth(); } else if(a instanceof Dog) { Dog d =(Dog)a; d.Pao(); } else if(a instanceof Pig) { Pig p =(Pig)a; p.sleep(); } } }
多态的好处是大大提高了函数的扩展性！