标签：
scheduleAtFixedRate 没有什么歧义，很容易理解，就是每隔多少时间，固定执行任务。
貌似也是推迟一段时间执行任务，但Oracle的解释如下,delay 的意思是当结束前一个执行后延迟的时间
scheduleWithFixedDelay Parameters:
command - the task to execute
initialDelay - the time to delay first execution
delay - the delay between the termination of one execution and the commencement of the next
unit - the time unit of the initialDelay and delay parameters
scheduleWithFixedDelay 比如当前一个任务结束的时刻，开始结算间隔时间，如0秒开始执行第一次任务，任务耗时5秒，任务间隔时间3秒，那么第二次任务执行的时间是在第8秒开始。
import java.util.Date; public class WorkerThread implements Runnable{ private String command; public WorkerThread(String s){ this.command=s; } @Override public void run() { System.out.println(Thread.currentThread().getName()+" Start. Time = "+new Date()); processCommand(); System.out.println(Thread.currentThread().getName()+" End. Time = "+new Date()); } private void processCommand() { try { Thread.sleep(5000); } catch (InterruptedException e) { e.printStackTrace(); } } @Override public String toString(){ return this.command; } }
import java.util.Date; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; public class ScheduledThreadPool { public static void main(String[] args) throws InterruptedException { ScheduledExecutorService scheduledThreadPool = Executors.newScheduledThreadPool(5); System.out.println("Current Time = "+new Date()); for(int i=0; i<10; i++){ Thread.sleep(1000); WorkerThread worker = new WorkerThread("do heavy processing"); //scheduledThreadPool.schedule(worker, 3, TimeUnit.SECONDS); //scheduledThreadPool.scheduleAtFixedRate(worker, 5, 5, TimeUnit.SECONDS); scheduledThreadPool.scheduleWithFixedDelay(worker, 5, 3, TimeUnit.SECONDS); } Thread.sleep(300000); scheduledThreadPool.shutdown(); while(!scheduledThreadPool.isTerminated()){ } System.out.println("Finished all threads"); } }
（原创）定时线程池中scheduleWithFixedDelay和scheduleAtFixedRate的区别
标签：
原文地址：http://www.cnblogs.com/starcrm/p/5010336.html
