Java多线程实现之Executor详解

        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                System.out.println("runnable 线程开始执行");
            }
        };
        Executor executor = Executors.newCachedThreadPool();
        executor.execute(runnable);
        executor.execute(runnable);
        executor.execute(runnable);

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

/**
	 * @param corePoolSize 代表默认线程数，或者说最低线程数，也就是此线程池创建后里面立马会有几个线程的数量
	 * @param maximumPoolSize 代表最大线程数，超过此线程数量则排队等待执行，排队线程放入最后一个参数中
	 * @param keepAliveTime 表示默认线程数量外的已经创建出来的线程在处于空闲状态下，被回收前需要等待的时间
	 * @param unit 表示第三个时间值的单位
	 * @param workQueue 用于盛放多余任务的线程队列
	 */
	ThreadPoolExecutor(int corePoolSize,
                              int maximumPoolSize,
                              long keepAliveTime,
                              TimeUnit unit,
                              BlockingQueue<Runnable> workQueue)

public static ExecutorService newSingleThreadExecutor() {
        return new FinalizableDelegatedExecutorService
            (new ThreadPoolExecutor(1, 1,
                                    0L, TimeUnit.MILLISECONDS,
                                    new LinkedBlockingQueue<Runnable>()));
    }

public static ExecutorService newFixedThreadPool(int nThreads) {
        return new ThreadPoolExecutor(nThreads, nThreads,
                                      0L, TimeUnit.MILLISECONDS,
                                      new LinkedBlockingQueue<Runnable>());
    }

        Runnable precessImageRunner = new Runnable() {
            @Override
            public void run() {
                System.out.println("开始处理图片了，我很耗时，，，，");
            }
        };
        List<Bitmap> bitmaps = new ArrayList<>();
        ExecutorService fixedExecutor = Executors.newFixedThreadPool(30);
        for (Bitmap bitmap : bitmaps) {
            fixedExecutor.execute(precessImageRunner);
        }
        fixedExecutor.shutdown();

//  Executor 五种创建线程的方式
        Executors.newCachedThreadPool();
        Executors.newSingleThreadExecutor();
        Executors.newFixedThreadPool();
        Executors.newScheduledThreadPool();
        Executors.newSingleThreadScheduledExecutor();