Executor--线程的执行器

Java SE5的java.util.concurrent包中的执行器（Executor）用来管理Thread对象，从而简化并发编程。

关灯线程：

public class LiftOffThread implements Runnable {

    protected int countDown = 10;
    private static int taskCount = 0;
    private final int id = taskCount++;

    public LiftOffThread() {
    }

    public String status() {
        return "#" + id + "(" + (countDown > 0 ? countDown : "LiftOff") + ")";
    }

    @Override
    public void run() {
        while (countDown-- > 0) {
            System.out.println(status());
        }
    }
}

使用Excutor一:

ExecutorService mService = Executors.newCachedThreadPool();
   for (int i = 0; i < 5; i++) {
        mService.execute(new LiftOffThread());
   }
   mService.shutdown();

运行结果：

使用Excutor二：

//预先分配线程数
ExecutorService mService = Executors.newFixedThreadPool(3);
   for (int i = 0; i < 5; i++) {
        mService.execute(new LiftOffThread());
   }
   mService.shutdown();

运行结果：

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