Java 多态 案列

package com.bytezreo.duotai;

//多态性的使用 举例一
public class AnimalTest
{
    public static void main(String[] args) 
    {
        AnimalTest test = new AnimalTest();
        test.func(new Dog());
        
        
        test.func(new Cat());
        
        
    }
    
    //声明是 animal          Animal animal = new Dog();
    public void func(Animal animal)
    {
        animal.eat();
        animal.shout();
    }
    
    
    //没有多态性的时候
//    public void func(Dog dog)
//    {
//        dog.eat();
//        dog.shout();
//    }
//    
//    public void func(Cat cat)
//    {
//        cat.eat();
//        cat.shout();
//    }
//    
//    
    
}

class Animal
{
    public void eat()
    {
        System.out.println("动物：进食");
    }
    public void shout()
    {
        System.out.println("动物：叫");
    }
    
    
    
    
    
}

class Dog extends Animal
{
    public void eat()
    {
        System.out.println("狗：吃骨头");
    }
    public void shout()
    {
        System.out.println("狗：汪汪汪");
    }
}



class Cat extends Animal
{
    public void eat()
    {
        System.out.println("猫：吃大鱼");
    }
    public void shout()
    {
        System.out.println("猫：喵喵喵");
    }
}

//举例二

class Order
{
    public void method(Object obj)
    {
        
    }
}