java 线程池

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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 < 1; 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();                 }  }
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