ScheduledThreadPoolExecutor 继承自ThreadPoolExecutor实现了ScheduledExecutorService接口。主要完成定时或者周期的执行线程任务。
代码如下：
package com.itszt.test3;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
/**
* ScheduledThreadExecutor,定时任务线程池
*/
public class Test3 {
public static void main(String[] args) {
ScheduledExecutorService pool = Executors.newScheduledThreadPool(10);
System.out.println("main开始时间:"+MyRunnable.now());
for(int i=0;i<3;i++){
MyRunnable myRunnable = new MyRunnable("thread-" + i);
System.out.println(myRunnable.getName()+"开始时间:"+MyRunnable.now());
pool.schedule(myRunnable,5, TimeUnit.SECONDS);//延时5秒执行
//在一次调用完成和下一次调用开始之间有长度为delay的延迟
//pool.scheduleWithFixedDelay(myRunnable,5,5,TimeUnit.SECONDS);
}
try {
Thread.sleep(7000);
} catch (InterruptedException e) {
e.printStackTrace();
}
pool.shutdown();//7秒后不再接受执行线程
while (!pool.isTerminated()){
//等待所有线程结束
}
System.out.println("main结束时间:"+MyRunnable.now());
}
}
class MyRunnable implements Runnable{
private String name;
public MyRunnable(String name) {
this.name = name;
}
public String getName() {
return name;
}
@Override
public void run() {
System.out.println(getName()+"true start:"+now());
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(getName()+"true end:"+now());
}
static String now(){
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return format.format(new Date());
}
}
代码执行结果如下：
main开始时间:2018-03-24 21:08:06 thread-0开始时间:2018-03-24 21:08:06 thread-1开始时间:2018-03-24 21:08:06 thread-2开始时间:2018-03-24 21:08:06 thread-1true start:2018-03-24 21:08:11 thread-2true start:2018-03-24 21:08:11 thread-0true start:2018-03-24 21:08:11 thread-2true end:2018-03-24 21:08:14 thread-0true end:2018-03-24 21:08:14 thread-1true end:2018-03-24 21:08:14 main结束时间:2018-03-24 21:08:14
