线程池之可完成服务

public class CompletionServiceTest {

    public static void main(String[] args) throws InterruptedException, ExecutionException {
        ExecutorService pool = Executors.newFixedThreadPool(20);
        System.out.println("执行方式一............................");
        // 结果集合
        List<Future<Result>> futureList = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            // 任务类
            MyCallableTask task = new MyCallableTask(i);
            FutureTask<Result> futureTask = new FutureTask<>(task);
            pool.submit(futureTask);
            futureList.add(futureTask);
        }

        System.out.println("获取执行结果............................");
        futureList.forEach(e -> {
            try {
                System.out.println("获取执行结果:"+e.get().toString());
            } catch (Exception ex) {
                throw new RuntimeException(ex);
            }
        });

        System.out.println("执行方式二............................");
        // 按照完成的顺序获取它们的结果
        CompletionService<Result> executorCompletionService = new ExecutorCompletionService<>(pool);
        for (int i = 0; i < 10; i++) {
            MyCallableTask task = new MyCallableTask(i);
            executorCompletionService.submit(task);
        }
        System.out.println("获取执行结果二 ............................");
        for (int i = 0; i < 10; i++) {
           Future<Result> future = executorCompletionService.take();
            System.out.println("获取执行结果:"+future.get());
        }

        // 关闭线程池
        pool.shutdownNow();
    }


    static class MyCallableTask implements Callable<Result> {

        private int no;

        public MyCallableTask() {
        }

        public MyCallableTask(int no) {
            this.no = no;
        }

        @Override
        public Result call() throws Exception {
            System.out.println(no+" 执行任务中...");
            if (this.no == 1){
                System.out.println(no+" 1号执行任务中...");
                Thread.sleep(10000);
            } else {
                Thread.sleep(2000);
            }
            System.out.println(no+" 执行完成");
            return new Result("200",no+": OK");
        }

        public int getNo() {
            return no;
        }

        public void setNo(int no) {
            this.no = no;
        }
    }
}