2019独角兽企业重金招聘Python工程师标准>>> 
ScheduledThreadPoolExecutor用于定时任务，来支持周期性任务的调度
ScheduledThreadPoolExecutor继承了ThreadPoolExecutor，实现了ScheduledExecutorService。在线程池的基础上，实现了可调度的线程池功能
public class ScheduledThreadPoolExecutorTest {
public static void main(String agrs[]){
ScheduledThreadPoolExecutor executor = new ScheduledThreadPoolExecutor(4);
//指定时延后开始执行任务，以后每隔period的时长再次执行该任务
executor.scheduleAtFixedRate(new ThreadTest("Rate"),1,3, TimeUnit.SECONDS);
//指定时延后开始执行任务，以后任务执行完成后等待delay时长，再次执行任务
executor.scheduleWithFixedDelay(new ThreadTest("Delay"),1,3,TimeUnit.SECONDS);
//指定时延后调度执行任务
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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