线程池关系图

Executors

• has：ThreadPoolExecutor
  • use：DefaultThreadFactory
  • def：execute方法
  • is：AbstractExecutorService
    • imp：ExecutorService
      • is：Executor
        • declare：execute(Runnable run)
      • declare：submit、innvokeAll、shutdown、isterminated
    • def：submit方法
      • 将runnable或者callable对象转换成FutureTask<T>
      • 随后将上面得到的对象作为execute的参数
• def：DefaultThreadFactory (ref ThreadPoolExecutor)
• def：RunnableAdapter (ref FutureTask)

FutureTask

• imp：RunnableFuture
  • is：Runnable
    • declare：run
  • is：Future
    • declare：isCancelled, cancel, isDone, get
• use：RunnableAdapter
• def：run、isDone、isCancelled、cancel