ScheduledThreadPoolExecutor简单demo

参考:  高并发编程之ScheduledThreadPoolExecutor讲解

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class ScheduledThreadPoolExecutorTest {

    public static void main(String[] args) {
//        test01();
        test02();
//        test03();
    }

    public static void test01() {
        ScheduledThreadPoolExecutor stpe = new ScheduledThreadPoolExecutor(2);
        ScheduledFuture future = stpe.schedule(() -> System.out.println("当前时间：" + System.currentTimeMillis()), 2, TimeUnit.SECONDS);

        //有兴趣可以把下面两行代码的注释去掉玩玩看
        //cancel(true):是取消延迟执行
//        future.cancel(true);

    }

    public static void test02() {
        ScheduledThreadPoolExecutor stpe = new ScheduledThreadPoolExecutor(2);
        System.out.println(new SimpleDateFormat("HH:mm:ss").format(new Date()));
        // scheduleAtFixedRate以Runnable#run开始执行的时刻往后推period开始执行
        // 在initialDelay时间后,以period的时间间隔执行
        stpe.scheduleAtFixedRate(() -> {
            System.out.println("当前时间：" + new SimpleDateFormat("HH:mm:ss").format(new Date()) + " 我是周期性执行！");
            try {
                TimeUnit.SECONDS.sleep(2);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }, 1, 5, TimeUnit.SECONDS);

    }

    public static void test03() {
        ScheduledThreadPoolExecutor stpe = new ScheduledThreadPoolExecutor(2);
        System.out.println(new SimpleDateFormat("HH:mm:ss").format(new Date()));
        // scheduleWithFixedDelay以Runnable#run结束执行的时刻往后推delay开始执行
        // 在initialDelay时间后,以delay的时间间隔执行
        stpe.scheduleWithFixedDelay(() -> {
            System.out.println("当前时间：" + new SimpleDateFormat("HH:mm:ss").format(new Date()) + " 我是周期性执行！");
            try {
                TimeUnit.SECONDS.sleep(2);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }, 1, 5, TimeUnit.SECONDS);
    }
}