Thread中join()方法进行介绍 - 风止雨歇
http://www.cnblogs.com/skywang12345/p/3479275.html
https://blog.csdn.net/dabing69221/article/details/17472901
http://www.cnblogs.com/skywang12345/p/3479275.html
https://blog.csdn.net/dabing69221/article/details/17472901