有没有办法创建一个特定于玩家的倒计时，当玩家离开 Java 时该倒计时停止？

Question

我正在寻找一种方法来为我的银行系统插件在 Java 中创建特定于玩家的倒计时。

目前每个人都同时感兴趣，因为我使用的是 Bukkit 调度程序。

Bukkit.getScheduler().scheduleSyncRepeatingTask(Main.getPlugin(), new Runnable() {

    @Override
    public void run() {
        try {
            Statement stmt = DatabaseManager.getCon().createStatement();
            String sql = ("SELECT uuid, money FROM Accounts");
            stmt.executeUpdate("USE " + ConfigManager.getConf().getString("Database.DBName"));
            ResultSet rs = stmt.executeQuery(sql);
            while (rs.next()) {
                uids.add(rs.getString(1));
                money.put(rs.getString(1), rs.getInt(2));
            }
            if (!ConfigManager.getConf().getBoolean("Settings.PayInterestOffline")) {
                try {
                    for (String uid : uids) {
                        Player pl = Bukkit.getPlayer(UUID.fromString(uid));
                        if (pl == null) {
                            uids.remove(IndexIdentifier.getIndex(uid, uids));
                            money.remove(uid);
                        }
                    }
                } catch (Exception e) {
                }

            }
            for (int i = 0; i < uids.size(); i++) {
                try {
                    String puid = uids.get(i);
                    double doubleMoney = money.get(puid);
                    if (doubleMoney > ConfigManager.getConf().getInt("Settings.MaximumMoney")) {
                        continue;
                    } else {
                        doubleMoney = (((doubleMoney / 100) * percent) + doubleMoney);
                        int intMoney = (int) Math.ceil(doubleMoney);
                        stmt.executeUpdate("UPDATE Accounts SET money = " + intMoney + " WHERE uuid = '" + puid + "';");
                        Player p = Bukkit.getPlayer(UUID.fromString(puid));
                        if (p.isOnline() && p != null) {
                            p.sendMessage(
                                    "§aYou've credited an interest of §6" + (int) Math.ceil((intMoney / 100) * percent)
                                            + ".0 " + ConfigManager.getConf().getString("Settings.currency"));
                        }
                    }
                    money.remove(puid);
                    uids.remove(i);
                } catch (NullPointerException e) {
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}, 0, period);

有没有办法为每个在线玩家创建倒计时。这意味着当玩家离开服务器并在重新加入后恢复时，倒计时停止。

Answer 1

您可以将整数与哈希图中的玩家相关联：

HashMap<UUID, Integer> playersAndTimes = new HashMap<>();

当你想开始倒计时时将玩家添加到 HashMap：

playersAndTimes.put(player.getUniqueId(), time)

现在你只需要在插件启用循环遍历每个在线玩家时运行此函数，如果他们在 HashMap 中（对他们进行倒计时），它将每秒从他们的值中删除 1：

Bukkit.getScheduler().scheduleSyncRepeatingTask(Main.getPlugin(Main.class), new Runnable() {
    @Override
    public void run() {
        for (Player player : Bukkit.getOnlinePlayers()) {
            if (playersAndTimes.containsKey(player.getUniqueId())) {
                if (playersAndTimes.get(player.getUniqueId()) >= 1) {
                    playersAndTimes.put(player.getUniqueId(), playersAndTimes.get(player.getUniqueId()) - 1);
                } else {
                    //The Player's Time Has Expired As The Number Associated With Their UUID In The Hashmap Is Now Equal To 0.
                    //DO SOMETHING
                }
            }
        }
    }
}, 0, 20);