在统计文件行数的程序，多线程（读取用户输入取消）-document in a few statistical procedures, multithreading (read user input Cancellation)

基于队列中挂起的任务数自动调整线程数,使用策略来提供灵活性和可扩展性-Based on the queue pending tasks automatically adjust the number of threads, use strategies to provide flexibility and extensibility