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