小狗的状态

最新推荐文章于 2024-05-22 08:56:22 发布

jian_L

最新推荐文章于 2024-05-22 08:56:22 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/jian_L/article/details/78816156

本文通过一个狗的不同行为状态切换的例子，介绍了状态模式的基本概念及其实现方式。狗根据不同的场景表现出听从命令、遇到敌人狂吠、遇到朋友摇尾巴以及与其他狗嬉戏等不同状态。

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package dog;


interface DogState{
	public void showState();
}

class SoftlyState implements DogState{

	@Override
	public void showState() {
		System.out.println("听主人的命令");
	}
	
}


class MeetEnemyState implements DogState{

	@Override
	public void showState() {
		System.out.println("狂叫咬人");
	}
	
}



class MeetFriendState implements DogState{

	@Override
	public void showState() {
		System.out.println("晃动尾巴欢迎");
		
	}
	
}


class MeetAnotherDog implements DogState{

	@Override
	public void showState() {
		System.out.println("嬉戏");
		
	}
	
}

class Dog{
	DogState state;
		public void show(){
			state.showState();
		}
		public void setState(DogState s){
			state=s;
		}
}

public class CheckDogState {
	public static void main(String args[]){
		Dog yellowDog=new Dog();
		System.out.print("狗在主人面前：");
		yellowDog.setState(new SoftlyState());
		yellowDog.show();
		System.out.print("狗遇到敌人：");
		yellowDog.setState(new MeetEnemyState());
		yellowDog.show();
		System.out.print("狗遇到朋友：");
		yellowDog.setState(new MeetFriendState());
		yellowDog.show();
		System.out.print("狗遇到同伴：");
		yellowDog.setState(new MeetAnotherDog());
		yellowDog.show();
	}
	
}