3 ScheduledExecutorService

package cn.ys.timer;

import java.util.Date;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class TestScheduledExecutorService {

    public static void main(String[] args) {

        ScheduledExecutorService service = Executors.newSingleThreadScheduledExecutor();

        /**
         * 参数：
         * 1、任务体
         * 2、首次执行的延时时间
         * 3、任务执行间隔
         * 4、间隔时间单位
         */
        service.scheduleAtFixedRate(
                ()->System.out.println("task ScheduledExecutorService： " + new Date()),
                0,
                3,
                TimeUnit.SECONDS);
    }
}

控制台每3秒打印一次时间：

task ScheduledExecutorService： Sat Aug 10 12:37:52 CST 2019
task ScheduledExecutorService： Sat Aug 10 12:37:55 CST 2019
task ScheduledExecutorService： Sat Aug 10 12:37:58 CST 2019
task ScheduledExecutorService： Sat Aug 10 12:38:01 CST 2019
......