java8线程池如何使用

1、线程池的特点是提供一个线程队列，队列中保存着所有等待状态的线程。避免了创建与销毁额外开销，提高了响应速度。

2、线程池的所有类在java.util.concurrent.Executor：负责线程的使用与调度的根接口

3、创建固定大小线程池ExecutorService executorService = Executors.newFixedThreadPool(5);

4、为线程池的线程分配任务executorService.submit(new Thread(new Runna芟鲠阻缒ble() { @Override public void run() { System.out.println("------------"); } }));

5、关闭线程池executorService.shutdown();

6、线程池执行Callable线程Future<Integer> future = executorService.submit(new Callable<Integer>() { public Integer call() throws Exception { int sum = 0; for (int i = 0; i < 100; i++) { sum += i; } return sum; } });

7、得到程序的返回结果Integer sum = future.get();

8、在线程池中提交十个线程执行程序。List<Future<Integer争犸禀淫>> list = new ArrayList<>(); for (int i = 0; i < 10; i++) { Future<Integer> future = executorService.submit(new Callable<Integer>() { public Integer call() throws Exception { int sum = 0; for (int i = 0; i < 100; i++) { sum += i; } return sum; } }); list.add(future); }