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ExecutorService pool=Executors.newFixedThreadPool(10);
newFixedThreadPool的底层源码是
new ThreadPoolExecutor(nThreads,nThreads,0L,TimeUnit.
MILLISECONDS，new LinkedBlockingQueue<Runnable>());
newCachedsThreadPool()的底层源码是
new ThreadPoolExecutor(0,Integer.MAX_VALUE，60L，TimeUnit.SECONDS，new SynchronusQueue<Runnable>());
newSingleThreadExecutor()的底层源码是
new FinalizableDelegatedExecutorService（new ThreadPoolExecutor(1,1,0L,TimeUnit.MILLISECONDS，new LinkedBlockingQueue<Runnable>())）;
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