ExecutorService为创建的线程池ExecutorService pool = Executors.newFixedThreadPool(POOL_SIZE)

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ExecutorService就是要创建的线程池  JAVA中线程池用类ExecutorService代表

，案例ExecutorService pool = Executors.newFixedThreadPool(POOL_SIZE)

底层都是通过ThreadPoolExecutor实现的

public static ExecutorService newCachedThreadPool() {return new ThreadPoolExecutor(0, Integer.MAX_VALUE,60L, TimeUnit.SECONDS,new SynchronousQueue<Runnable>());}

http://www.mamicode.com/info-detail-2577910.html

案例

 // 方法一，自己写集合来实现获取线程池中任务的返回结果
    public void testByQueue() throws Exception {
        long start = System.currentTimeMillis();
        AtomicInteger count = new AtomicInteger(0);
        // 创建线程池
        ExecutorService pool = Executors.newFixedThreadPool(POOL_SIZE);
        //队列,拿任务的执行结果
        BlockingQueue<Future<Integer>> queue = 
                new LinkedBlockingQueue<>();

        // 向里面扔任务
        for (int i = 0; i < TOTAL_TASK; i++) {
            Future<Integer> future = pool.submit(new WorkTask("ExecTask" + i));
            queue.add(future);
        }

        // 检查线程池任务执行结果
        for (int i = 0; i < TOTAL_TASK; i++) {
            int sleptTime = queue.take().get();
            //System.out.println(" slept "+sleptTime+" ms ...");            
            count.addAndGet(sleptTime);
        }

        // 关闭线程池
        pool.shutdown();
        System.out.println("-------------tasks sleep time "+count.get()
                +"ms,and spend time "
                +(System.currentTimeMillis()-start)+" ms");
    }

 

其中WorkTask实现了接口Callable

public class WorkTask implements Callable<Integer> {
    private String name;
    public WorkTask(String name) {
        this.name = name;
    }

    @Override
    public Integer call() {
        int sleepTime = new Random().nextInt(1000);
        try {
            Thread.sleep(sleepTime);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        // 返回给调用者的值
        return sleepTime;
    }
}

 

 

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