使用newScheduledThreadPool来模拟心跳机制

 1 public class HeartBeat {
 2     public static void main(String[] args) {
 3         ScheduledExecutorService executor = Executors.newScheduledThreadPool(5);
 4         Runnable task = new Runnable() {
 5             public void run() {
 6                 System.out.println("HeartBeat.........................");
 7             }
 8         };
 9         executor.scheduleAtFixedRate(task,5,3, TimeUnit.SECONDS);   //5秒后第一次执行，之后每隔3秒执行一次
10     }
11 }

HeartBeat....................... //5秒后第一次输出
HeartBeat....................... //每隔3秒输出一个