public static class ThreadPoolExecutor.CallerRunsPolicy extends Object implements RejectedExecutionHandler
execute方法的调用线程中运行被拒绝的任务,除非执行程序已被关闭,否则这个任务被丢弃。 
      | Constructor and Description | 
|---|
| CallerRunsPolicy()
              创建一个 
              CallerRunsPolicy。 | 
public void rejectedExecution(Runnable r, ThreadPoolExecutor e)
rejectedExecution在界面 
            RejectedExecutionHandler 
           r - 请求执行的可运行任务 
           e - 执行器尝试执行此任务 
            Submit a bug or feature 
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