类ThreadPoolExecutor
protected void finalize()execute（）等方法
接口RunnableFuture
run()
接口ExecutorService
void shutdown()List shutdownNow()boolean isShutdown()boolean isTerminated()submit(Callable task) submit(Runnable task)
接口Runnable
run()
类ScheduledThreadPoolExecutor
接口Future
1，cancel(boolean mayInterruptIfRunning) 2，get() 3，isCancelled()4，isDone()
接口Executor
execute(Runnable command)
接口Callable
T call()
类Executors
1，static ThreadFactory defaultThreadFactory() 2，static ExecutorService\tnewCachedThreadPool()3，static ExecutorService\tnewCachedThreadPool(ThreadFactory threadFactory)4，static Callable\tcallable(Runnable task)
ExecutorService的工厂方法
接口ScheduledExecutorService
类FutureTask
Callable callable
get()阻塞方法run()等实现方法
类AbstractExecutorService
newTaskFor（）等方法
