java观察者模式

观察者设定一个观察目标，根据观察目标的变化，观察者采取相应的应对行为---观察者模式

//玩家类
public class Player {
    
    private String name;
    private Team t;
    
    public Player(String name){
        this.name = name;
    }
    
    public String getName(){
        return name;
    }
    
    public void setTeam(Team t){
        this.t= t;
    }
    
    //如果玩家被攻击，通知游戏中心进行呼救
    public void beAttacked(Controller c){
        System.out.println(name + "被攻击~速来援助~");
        c.noticeOther(t,name);
        
    }

    //用来援助队友的
    public void help(){
        System.out.println("挺住！" + name + "来也~~~");
    }
}

//战队类
import java.util.ArrayList;
import java.util.List;

public class Team {
    
    @SuppressWarnings("unused")
    private String name;
    
    private List<Player> players = new ArrayList<Player>();
    
    public Team(String name){
        this.name = name;
        System.out.println(name + "战队组建成功！");
    }
    
    public void join(Player p){
        this.players.add(p);
        p.setTeam(this);
    }

    public void help(String name) {
        for (Player player : players) {
            if (!player.getName().equals(name)) {
                player.help();
            }
        }
    }

}

//游戏中心
public class Controller {
        
    public void noticeOther(Team t,String name){
        t.help(name);
    }

}


//
public class ObserverTestDemo {

    public static void main(String[] args) {

        Controller c = new Controller();

        Team t = new Team("金庸");

        Player p1 = new Player("令狐冲");
        t.join(p1);
        Player p2 = new Player("张无忌");
        t.join(p2);
        Player p3 = new Player("东方不败 ");
        t.join(p3);
        Player p4 = new Player("杨过");
        t.join(p4);

        p1.beAttacked(c);
    }

}