girlshavapets.java.txt

web 程序设计 jsp简单开发 java语言基础

package ch7.section7_3;

public class GirlsHavaPets {
	public static void main(String[] args) {
		Cat cat1 = new Cat("lingling", "白");
		Dog dog1 = new Dog("jiajia", "黑");
		Dog dog2 = new Dog("yuanyuan", "灰");
		Girl g1 = new Girl("girl 1", cat1);
		Girl g2 = new Girl("girl 2", dog1);
		Girl g3 = new Girl("girl 3", dog2);
		dog2.setState(0); //设定2号狗的状态为睡着状态
		g1.petRun();
		g2.petRun();
		g3.petRun();
	}
}
class Girl {
	private String name;
	private Animal pet;  //girl养了一个宠物
	Girl(String name, Animal pet) {
		this.name = name;
		this.pet = pet;
	}
	void petRun() {
		System.out.print(name+"'s pet:");
		pet.run();  //父类引用指向子类对象
	}
}
class Cat extends Animal {
	Cat(String name, String color) {
		super(name, color);
	}
	//重写了父类的run()方法
	void run() {
		if(this.state == 1) {
			System.out.println(this.name + "在跑！");
		} else {
			System.out.println(this.name + "已睡着！");
		}
	}
}

class Dog extends Animal {
	Dog(String name, String color) {
		super(name, color);
	}
	//重写了父类的run()方法
	void run() {
		if(this.state == 1) {
			System.out.println(this.name + "在跑！");
		} else {
			System.out.println(this.name + "已睡着！");
		}
	}
}