ScheduledThreadPoolExecutor

ScheduledThreadPoolExecutor用於定時任務，來支持週期性任務的調度

ScheduledThreadPoolExecutor繼承了ThreadPoolExecutor，實現了ScheduledExecutorService。在線程池的基礎上，實現了可調度的線程池功能

public class ScheduledThreadPoolExecutorTest {


    public static void main(String agrs[]){
        ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(4);
        //指定時延後開始執行任務，之後每隔period的時長再次執行該任務
        executor.scheduleAtFixedRate(new ThreadTest("Rate"),1,3, TimeUnit.SECONDS);
        //指定時延後開始執行任務，之後任務執行完成後等待delay時長，再次執行任務
        executor.scheduleWithFixedDelay(new ThreadTest("Delay"),1,3,TimeUnit.SECONDS);
        //指定時延後調度執行任務
        executor.schedule(new ThreadTest("schedule"),5,TimeUnit.SECONDS);
    }

    static class ThreadTest implements Runnable{

        private String name;

        public ThreadTest(String name) {
            this.name = name;
        }

        @Override
        public void run() {
            System.out.println(name+" start"+new Date());
            System.out.println();
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(name +" end"+new Date());
        }
    }

}

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