使用JDA在Discord消息中创建倒数计时器

问题描述

我正在尝试在JDA中创建一个倒数计时器。我认为我做的不对。输入的原始命令将被不断编辑以显示正在进行的倒计时。如for循环所示，倒计时的最长时间为48小时。这是我的代码：

@Override
public void onGuildMessageReceived(GuildMessageReceivedEvent event) {
    super.onGuildMessageReceived(event);

    //!countdown hours:minutes:seconds
    if (event.getMessage().getContentRaw().startsWith("!countdown")) {
        String timebuilder = "";
        char[] chararr = event.getMessage().getContentRaw().tochararray();
        
        for (int i = 11; i < chararr.length; i++) {
            timebuilder += chararr[i];
        }
    //  event.getChannel().sendMessage(timebuilder).queue();
        int hour = Integer.parseInt(timebuilder.substring(0,1));
        int minute = Integer.parseInt(timebuilder.substring(3,4));
        int second = Integer.parseInt(timebuilder.substring(6,7));
        
        for (int i = 0; i < 172800; i++ ) {
            try {
                TimeUnit.SECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printstacktrace();
            }
            
            // 0 0 0
            if (hour == 0 && minute == 0 && second == 0) {
                event.getMessage().editMessage("00:00:00");
                event.getChannel().sendMessage("Countdown complete!").queue();
                break;
            }
            // 0 1 1
            else if (hour == 0 && minute > 0 && second > 0) {
                minute--;
                second--;
                event.getMessage().editMessage(hour + ":" + minute + ":" + second).queue();;
            }
            //0 1 0
            else if (hour == 0 && minute > 0 && second == 0) {
                minute--;
                second = 59;
                event.getMessage().editMessage(hour + ":" + minute + ":" + second).queue();;
            }
            //1 0 0 
            else if (hour > 0 && minute == 0 && second == 0) {
                second = 59;
                minute = 59;
                hour--;
                event.getMessage().editMessage(hour + ":" + minute + ":" + second).queue();;
            }
            //0 0 1 //1 0 1 //1 1 1 
            else if ((hour == 0 && minute == 0 && second > 0) || (hour > 0 && minute == 0 && second > 0) || (hour > 0 && minute > 0 && second > 0)) {
                second--;
                event.getMessage().editMessage(hour + ":" + minute + ":" + second).queue();
            }
    
            //1 1 0
            else if (hour > 0 && minute > 0 && second == 0) {
                minute--;
                event.getMessage().editMessage(hour + ":" + minute + ":" + second).queue();
            }
            
        }
    }
}

似乎有一种更简单的方法可以做到这一点。使用Timer或SimpleDateFormat之类的东西，但我只是不知道那会是什么。由于某些原因，我的消息未使用.editMessage()方法进行编辑。

输出：

!countdown 01:02:02 //user keyed discord bot command

对于预期的输出，应该使用已更新的倒数继续编辑“！countdown 01:02:02”消息。如下图所示：

预期输出：

!countdown 01:02:02 //user keyed discord bot command
01:02:01 //original command
01:02:00 //original command
01:01:59 //original command

etc...

解决方法

您应该能够使用Timer和TimerTask，该Timer用于安排Timer Task。计时器用于在线程后台调度任务，如下所示：

<div class="top-level">
  <div class="first-parent">
      <h1 class="animate">Require a transition-delay of 0.25</h1>
      <p class="animate">Require a transition-delay of 0.5</p>
  </div>
  <div class="second-parent">
      <div class="random-div">
          <div class="animate">Require a transition-delay of 0.75</div>
      </div>
  </div>
</div>