public abstract class AllyControlCenter {/*** 战队名称*/protected String allyName;/*** 定义一个集合用于存储战队成员*/protected List<Observer> players = new ArrayList<Observer>();public String getAllyName() {return allyName;}public void setAllyName(String allyName) {this.allyName = allyName;}/*** 注册方法* @param player*/public void join(Observer player){System.out.println(MessageFormat.format("{0}加入{1}战队", player.getName(), this.allyName));players.add(player);}/*** 注销方法* @param player*/public void quit(Observer player){System.out.println();System.out.println(MessageFormat.format("{0}退出{1}战队", player.getName(), this.allyName));players.remove(player);}/*** 声明抽象通知方法*/public abstract void notifyObserver(String name);
}

public class ConcreteAllyControlCenter extends AllyControlCenter {public ConcreteAllyControlCenter(String allyName) {System.out.println(MessageFormat.format("{0}战队组件成功！", allyName));System.out.println();System.out.println("控制中心发布盟友召集令");System.out.println("---------------------------------");this.allyName = allyName;}@Overridepublic void notifyObserver(String name) {System.out.println();System.out.println(MessageFormat.format("{0}战队紧急通知：盟友{1}正在遭受攻击，请速速支援！", this.allyName, name));System.out.println();// 遍历观察者集合，调用每一个盟友（自己除外）的支援方法for(Observer player : this.players){if(!player.getName().equalsIgnoreCase(name)){player.help();}}}
}

public interface Observer {/*** 获取观察者名字* @return*/String getName();/*** 设置观察者名字* @param name*/void setName(String name);/*** 声明支援盟友方法*/void help();/*** 声明遭受攻击方法* @param acc*/void beAttacted(AllyControlCenter acc);}

public class Player implements Observer {private String name;public Player(String name) {this.name = name;}public String getName() {return this.name;}public void setName(String name) {this.name = name;}/*** 支援盟友方法的实现*/public void help() {System.out.println(MessageFormat.format("坚持住，{0}来救你！", this.name));}/*** 遭受攻击方法的实现，当遭受攻击时将调用战队控制中心类的通知方法notifyObserver()来通知盟友* @param acc*/public void beAttacted(AllyControlCenter acc) {System.out.println();System.out.println(MessageFormat.format("{0}被攻击", this.name));acc.notifyObserver(this.name);}
}