java线程池模拟并发

public class CountDownLatchTest1 implements Runnable{
    final AtomicInteger number = new AtomicInteger();
    volatile boolean bol = false;  

    @Override
    public void run() {
        System.out.println(number.getAndIncrement());
        synchronized (this) {
            try {
                if (!bol) {
                    System.out.println(bol);
                    bol = true;
                    Thread.sleep(10000);
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("并发数量为" + number.intValue());
        }  

    }  

    public static void main(String[] args) {
        ExecutorService pool = Executors. newCachedThreadPool();
        CountDownLatchTest1 test = new CountDownLatchTest1();
        for (int i=0;i<10;i++) {
            pool.execute(test);
        }
    }
}