Executors 工具类 创建 的 线程池

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());  
                }  
            },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();  
          
    }  
}