线程池 Executor框架

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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());

newCachedsThreadPool()的底层源码是

new ThreadPoolExecutor(0,Integer.MAX_VALUE，60L，TimeUnit.SECONDS，new SynchronusQueue());

newSingleThreadExecutor()的底层源码是

new FinalizableDelegatedExecutorService（new ThreadPoolExecutor(1,1,0L,TimeUnit.MILLISECONDS，new LinkedBlockingQueue())）;

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