了解线程如何通过文件对象在永久存储介质上互相发送数据。激活并启动一个线程，接着一个线程创建进程。每个线程从指定的文件中读取数据，数据的增加是以创建时发送给它的数量进行的，然后将新数值写回文件。-Learn how to file object thread-permanent storage medium to send data with each other. Activated and start a thread, and then a thread creation process. Each thread to read from the specified file, data, created based on the increase in the quantities sent to it, and then write the new value back to the file.