统一消息中心与排行系统的设计与实现

class Message {

String content;

Date timestamp;

public Message(String content) {

this.content = content;

this.timestamp = new Date();

在线排课软件

}

}

// 定义消息中心类

class UnifiedMessageCenter {

List messages = new ArrayList<>();

void addMessage(Message msg) {

synchronized (messages) {

messages.add(msg);

Collections.sort(messages, Comparator.comparing(Message::getTimestamp));

}

}

}

// 定义排行榜类

class Leaderboard {

Map rankings = new HashMap<>();

void updateRanking(String user, int score) {

rankings.put(user, score);

}

}