线程池FutureTask异步执行多任务实现详解

public class Test {
    //线程池最好作为全局变量, 若作为局部变量记得用完后shutdown()
    ThreadFactory namedThreadFactory = new ThreadFactoryBuilder(）.setNameFormat("thread-start-runner-%d").build();
    ExecutorService taskExe= new ThreadPoolExecutor(10,20,800L, TimeUnit.MILLISECONDS,new LinkedBlockingQueue<Runnable>(100),namedThreadFactory);
    
    int count=0;
    @Test
    public void test(String[] args) {
        
        //任务列表
        List<FutureTask<Integer>> taskList=new ArrayList<FutureTask<Integer>>();
        for(int i=0;i<100;i++){
            //创建100个任务放入【任务列表】
            FutureTask<Integer> futureTask=new FutureTask<Integer>(new Callable<Integer>() {
                @Override
                public Integer call() throws Exception {
                    return 1;
                }
            });
            //执行的结果装回原来的FutureTask中,后续直接遍历集合taskList来获取结果即可
            taskList.add(futureTask);
            taskExe.submit(futureTask);
        }
        //获取结果
        try{
            for(FutureTask<Integer> futureTask:taskList){
                count+=futureTask.get();
            }
        } catch (InterruptedException e) {
            logger.error("线程执行被中断",e);
        } catch (ExecutionException e) {
            logger.error("线程执行出现异常",e);
        }
        //关闭线程池
        taskExe.shutdown();
        //打印: 100
        System.out.println(count);
    }
}

public Future<?> submit(Runnable task) {
    if (task == null) throw new NullPointerException();
    //创建一个异步执行的任务FutureTask, 【隐患】也在它的run()代码块里
    RunnableFuture<Void> ftask = newTaskFor(task, null);
    execute(ftask);
    return ftask;
}