awaitTermination()是一个阻塞方法。它必须等线程池退出后才会结束自身。可以设置阻塞时间。

public class Test {

	public static void main(String[] args) throws IOException, InterruptedException {
		ExecutorService pool = Executors.newFixedThreadPool(2);
		for (int i = 0; i < 10; i++) {
			Runnable run = new Runnable() {
				@Override
				public void run() {
					System.out.println("线程运行" + Thread.currentThread().getName());
				}
			};
			service.execute(run);
		}
		pool.shutdown();
		while (!pool.awaitTermination(1, TimeUnit.SECONDS)) {
			System.out.println("线程池没有关闭");
		}
		System.out.println("线程池已经关闭");
	}
}