我想为游戏Java实现计时器吗？

void startTimer(int delaySeconds) {
  Executors.newSingleThreadScheduledExecutor().schedule(
    runnable,
    delaySeconds,
    TimeUnit.SECONDS);
}

runnable

Runnable runnable = new Runnable() {
  @Override public void run() {
    System.out.println(\"Hello, world!\");
  }
}

java.util.Timer

javax.swing.Timer

import java.awt.*;
import java.util.Timer;
import java.util.TimerTask;

public class TimerDemo {
  Toolkit toolkit;

  Timer timer;

  public TimerDemo(int seconds) {
    toolkit = Toolkit.getDefaultToolkit();
    timer = new Timer();
    timer.schedule(new RemindTask(), seconds * 1000);
  }

  class RemindTask extends TimerTask {
    public void run() {
      System.out.println(\"Time\'s up!\");
      toolkit.beep();
      System.exit(0); 
    }
  }

  public static void main(String args[]) {
    System.out.println(\"About to schedule task.\");
    new TimerDemo(30);
    System.out.println(\"Task scheduled.\");
  }
}  

public static void main(String args[]) {
  boolean flag = true;
  while (flag) {
      new TimerDemo(30);
      game();
    }
}