超级接口
Executor
+ void execute(Runnable command)
ThreadFactory
引用依赖
实现接口
ExecutorService
+ submit(Callable task):Future+ submit(Runnable task):Future
扩展父类
RunnableScheduledFuture
ExecutorCompletionService
ExecutorCompletionService(Executor executor)
FutureTask
CompletionService
ScheduledExecutorService
Future
Runnable
Callable
ScheduledFuture
ThreadPoolExecutor
RunnableFuture
RejectedExecutionHandler
AbstractExecutorService
ScheduledThreadPoolExecutor
