java之对象转型2

public class TestCasting2{
    public static void main(String args[]){
        TestCasting2 test2= new TestCasting2();
        
    
        Animal a = new Animal("animalName");
        Dog d = new Dog("dogName","dogColor");
        Cat c = new Cat("catName","catColor");
        
        test2.f(a);    test2.f(d);     test2.f(c);　　　　
    }
    public void f(Animal a){        //父类引用型参数，达到了面向对象苦苦追求的可复用性，多种类型的对象，共同使用一个方法
        System.out.println(a.name);
        
        if(a instanceof Dog){
            Dog d2 = (Dog)a;        //强制转换，然后就可以使用子类当中的属性了
            System.out.println(d2.folorColor);
        }else if(a instanceof Cat){
            Cat c2 = (Cat)a;
            System.out.println(c2.eyesColor);
        }                            //这里有过还有一个鸟对象，只需要加一个if判断语句就ok了，不需要重写一个方法public void f2(Bird bird){}
    }
}

class Animal{
    public String name;
    public Animal(String name){
        this.name = name;
    }
}
class Dog extends Animal{
    public String folorColor;
    public Dog(String name,String folorColor){
        super(name);
        this.folorColor = folorColor;
    }
}
class Cat extends Animal{
    public String eyesColor;
    public Cat(String name,String eyesColor){
        super(name);
        this.eyesColor = eyesColor;
    }
}