ScheduledExecutorService

// 延时3秒执行任务

ScheduledExecutorService scheduledThreadPool = Executors.newScheduledThreadPool(5);
scheduledThreadPool.schedule(new Runnable() {
    public void run() {
        System.out.println("delay 3 seconds");
    }
}, 3, TimeUnit.SECONDS);

// 延迟1秒后每3秒执行一次任务

ScheduledExecutorService scheduledThreadPool = Executors.newScheduledThreadPool(5);
scheduledThreadPool.scheduleAtFixedRate(new Runnable() {
    public void run() {
        System.out.println("delay 1 seconds, and excute every 3 seconds");
    }
}, 1, 3, TimeUnit.SECONDS);