Executors 工具类 创建 的 线程池详解编程语言

import java.util.concurrent.ExecutorService;   
import java.util.concurrent.Executors;   
import java.util.concurrent.ScheduledExecutorService;   
import java.util.concurrent.TimeUnit;   
   
public class ThreadPoolTest {   
    static int num = 100;   
    public static void main(String[] args) throws InterruptedException {   
        //固定线程数量的线程池，有任务就派空闲线程去执行，多余的任务等待   
        //ExecutorService  pool= Executors.newFixedThreadPool(3);   
        //根据任务需要，自动创建线程，且 前面已创建的线程，空闲时，可被复用   
        //ExecutorService  pool= Executors.newCachedThreadPool();   
        //单个线程，若执行期出现失败而终止此单个线程，则会建一个新线程来代替，运行任务   
        ExecutorService  pool= Executors.newSingleThreadExecutor();   
        //给线程池加 10条任务   
        for (int j= 0; j < 10; j++) {   
            final int task = j;   
            pool.execute(new Runnable() {   
                   
                @Override   
                public void run() {   
                    // TODO Auto-generated method stub   
                    for (int i=0; i < 10; i++) {   
                        System.out.println(Thread.currentThread().getName() + "--" +i   
                                + "--" + task + " of taks" + " 计数：" + (--num));   
                    }   
                }   
            });   
            // Thread.sleep(20);   
        }   
        //可安排在给定的延迟后运行或定期执行的命令。    
        ScheduledExecutorService service = Executors.newScheduledThreadPool(3);   
        for (int i = 0; i < 5; i++) {   
            final int x = i;   
            service.scheduleAtFixedRate(new Runnable() {   
                   
                @Override   
                public void run() {   
                    // TODO Auto-generated method stub   
                    System.out.println("Boon " + x + "  "  + Thread.currentThread().getName());   
                }   
            },0,2,TimeUnit.SECONDS);//延迟0秒，周期2秒   
        }   
           
        //poor.shutdownNow();//试图马上停了所有正在执行的任务，返回任务列表   
        pool.shutdown();//把分配给线程池的任务都执行完，就不再等待接受新任务了，   
    //  service.shutdown();   
           
    }   
}