一个多线程的简单使用步骤和方法。对线程不熟悉，认识比较浅的人，可以下载看看，方法带注释了，非常方便，适合初学者。-A multi-threaded use simple steps and methods.Understanding of threads are not familiar with, lighter, can download and see, annotated method, is very convenient, suitable for beginners.