线程池类结构图

AbstractExcutorService

DiscardPolicy

ThreadFactory

+newThread(Runnable r):Thread

DiscardOldestPolicy

ThreadPoolExcutor

- workers:HashSet<Worker> -corePoolSize:int-maximumPoolSize:int-workQueue:BlockingQueue<Runnable> -keepAliveTime:long-threadFactory:ThreadFactory-handler:RejectedExecutionHandler

<<interface>>Excutor

AbortPolicy

worker

 thread:ThreadfirstTask:Runnable

Runnable

+ run():void

CallerRunsPolicy

<<interface>>ExcutorService

Excutors

+ newCachedThreadPool()():ExecutorService+newFixedThreadPool(int nThreads):ExecutorService+newSingleThreadExecutor():ExecutorService...

DefaultThreadFactory

<<interface>>RejectedExecutionHandler

AQS