Java 抽象类

abstract class Animal {
    private String name;
    Animal (String name) {this.name = name;}
    /*
    punlic void enjoy() {
        System.out.println("叫声……")；

    */
    public abstract void enjoy();
}

abstract class Cat extends Animal {
    private String eyesColor;
    Cat(String n,String c) {super(n); eyesColor = c;}
}

class Dog extends Animal {
    private String furColor;
    Dog(String n,String c) {super(n); furColor = c;}

    public void enjoy() {
        System.out.println("狗叫声……");
    }
}

class Bird extends Animal {
    Bird() {
        super("bird");
    }
    public void enjoy() {
        System.out.println("鸟叫声……");
    }
}

class Lady {
    private String name;
    private Animal pet;
    Lady(String name,Animal pet) {
        this.name = name; this.pet = pet;
    }
    public void myPetEnjoy(){pet.enjoy();}
}

public class Main {
    public static void main(String args[]){
//    Cat c = new Cat("catname","blue");

    Dog d = new Dog("dogname","black");
    Bird b = new Bird();
// Lady l1 = new Lady("l1",c);

    Lady l2 = new Lady("l2",d);
    Lady l3 = new Lady("l3",b);
    //l1.myPetEnjoy();

    l2.myPetEnjoy();
    l3.myPetEnjoy();
    }
}