【Concurrency-ScheduledExecutorService】

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简介

线程池执行者在ThreadPoolExecutor的基础上给我们提供了延时（delay）执行和周期执行的功能。性能会优于Timer包。

继承结构

参考：

ThreadPoolExecutor

Executor

ExecutorService

ScheduledExecutorService

AbstractExecutorService

DEMO

package calvin;

import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

public class TestScheduledThreadPoolExecutor {
	public static ScheduledThreadPoolExecutor executor = null;

	public static void main(String[] args){
		System.out.println("test ScheduledThreadPoolExecutor");
		executor = new ScheduledThreadPoolExecutor(5);
		myTask task = new myTask();
		// 2秒后执行，执行后就停止
		executor.schedule(task, 2l, TimeUnit.SECONDS);
		// 5秒后执行，执行完后每10秒再执行不会自动停止
		executor.scheduleWithFixedDelay(task, 5l, 10, TimeUnit.SECONDS);

	}

	public static class myTask implements Runnable{
		public AtomicInteger index = new AtomicInteger();
		@Override
		public void run(){
			System.out.println(System.currentTimeMillis() + "start working  thread = "+Thread.currentThread().getName() + " index =" + index.incrementAndGet());
		}

	}
}

小结

1. 对于Executor对象来说他的task执行顺序是根据FIFO原则来运行的
2. 给我们提供了定时执行任务的功能