NBA之状态模式

2017-12-21 84 阅读1分钟

Design Pattern:

In State pattern a class behavior changes based on its state. This type of design pattern comes under behavior pattern. 模式：类的行为是根据自己的状态而改变的,属于行为模式

故事场景： //Curry一般都是上午运球,下午投篮所以Curry的训练根据时间状态变化

public interface Time {

    public void doAction(Player player);

}
public class Morning implements Time {

    @Override
    public void doAction(Player player) {
        player.setTime(this);
    }
}
public class Afternoon implements Time {

    @Override
    public void doAction(Player player) {
       player.setTime(this);
    }
}

Curry

public class Player {

    private Time time;

    public void play(){
        if (time instanceof Morning){
            System.out.println("上午运球");
        }else if(time instanceof Afternoon){
            System.out.println("下午投篮");
        }else{
            System.out.println("休息");
        }
    }

    public Time getTime() {
        return time;
    }

    public void setTime(Time time) {
        this.time = time;
    }
}

实验的开始

   public class StateDemo {


       public static void main(String[] args) {
           Player curry = new Player();
           Morning morning = new Morning();
           morning.doAction(curry);
           curry.play();

           Afternoon afternoon = new Afternoon();
           afternoon.doAction(curry);
           curry.play();
       }
   }

结果