public static void main(String[] args) {
    int corePoolSize = 0;
    int maximumPoolSize = 0;
    long keepAliveTime = 0;
    TimeUnit unit = TimeUnit.SECONDS;
    //1.SynchronousQueue：一個(gè)不存儲(chǔ)元素的阻塞隊(duì)列，每個(gè)插入操作必須等到另一個(gè)線程調(diào)用移除操作，
    //否則插入操作一直處于阻塞狀態(tài)。因此，如果線程池中始終沒(méi)有空閑線程（任務(wù)提交的平均速度快于被處理的速度），
    //可能出現(xiàn)無(wú)限制的線程增長(zhǎng)。
    //2.LinkedBlockingQueue：基于鏈表結(jié)構(gòu)的阻塞隊(duì)列，如果不設(shè)置初始化容量，
    //其容量為Integer.MAX_VALUE，即為無(wú)界隊(duì)列。因此，如果線程池中線程數(shù)達(dá)到了corePoolSize，
    //且始終沒(méi)有空閑線程（任務(wù)提交的平均速度快于被處理的速度），任務(wù)緩存隊(duì)列可能出現(xiàn)無(wú)限制的增長(zhǎng)。
    //3.ArrayBlockingQueue：基于數(shù)組結(jié)構(gòu)的有界阻塞隊(duì)列，按FIFO排序任務(wù)。
    BlockingQueue<Runnable> workQueue = new ArrayBlockingQueue<>(100);
    ThreadFactory threadFactory = new ThreadFactory() {
      @Override
      public Thread newThread(Runnable r) {
        return new Thread("newThread");
      }
    };
    //1.AbortPolicy：丟棄任務(wù)并拋出RejectedExecutionException異常，默認(rèn)策略；
    //2.CallerRunsPolicy：由調(diào)用execute方法的線程執(zhí)行該任務(wù)；
    //3.DiscardPolicy：丟棄任務(wù)，但是不拋出異常;
    //4.DiscardOldestPolicy：丟棄阻塞隊(duì)列最前面的任務(wù)，然后重新嘗試執(zhí)行任務(wù)（重復(fù)此過(guò)程）。
    RejectedExecutionHandler handler = new RejectedExecutionHandler() {
      @Override
      public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
      }
    };
    ThreadPoolExecutor threadPoolExecutor = 
        new ThreadPoolExecutor(
            corePoolSize, 
            maximumPoolSize, 
            keepAliveTime,
            unit, 
            workQueue);
    ThreadPoolExecutor threadPoolExecutor1 = 
        new ThreadPoolExecutor(
            corePoolSize, 
            maximumPoolSize, 
            keepAliveTime,
            unit, 
            workQueue, 
            threadFactory);
    ThreadPoolExecutor threadPoolExecutor2 = 
        new ThreadPoolExecutor(
            corePoolSize, 
            maximumPoolSize, 
            keepAliveTime, 
            unit, 
            workQueue, 
            handler);
    ThreadPoolExecutor threadPoolExecutor3 = 
        new ThreadPoolExecutor(
            corePoolSize, 
            maximumPoolSize, 
            keepAliveTime, 
            unit, 
            workQueue, 
            threadFactory, 
            handler);
  }