java动态绑定和多态

动态绑定，也叫多态。

TestPolymoph.java

//java动态绑定和多态
//动态绑定，也叫多态。
class Animal {
	private String name;

	Animal(String name) {
		this.name = name;
	}

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

}

class Cat extends Animal {
	private String eyesColor;
	
	Cat(String n,String c) {
		super(n); 
		eyesColor = c;
	}
	
	public void enjoy() {
	System.out.println("猫叫声......");
	}

}

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;//姓名
	private Animal pet;//宠物Animal类
	
	Lady(String name,Animal pet) {
		this.name = name; 
		this.pet = pet;
	}
	
	//我的宠物高兴了
	public void myPetEnjoy(){
		pet.enjoy();
	}
}

/*
	动态绑定总结：
	1.要有继承
	2.要有重写
	3.父类引用指向子类对象
*/
public class TestPolymoph {
	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);
		
		//根据实际的对象来确定调用的方法，不是通过引用类型来确定的，不然就就一定调用Animal中的enjoy()方法，
		l1.myPetEnjoy();
		l2.myPetEnjoy();
		l3.myPetEnjoy();
	}
}