Static class in Java

http://www.geeksforgeeks.org/static-class-in-java/

“Static Class in Java.” GeeksforGeeks, 24 Feb. 2014, www.geeksforgeeks.org/static-class-in-java/. Accessed 23 Feb. 2017.

Stack

http://www.ruanyifeng.com/blog/2013/11/stack.html

“Stack的三种含义.” Stack的三种含义 - 阮一峰的网络日志, www.ruanyifeng.com/blog/2013/11/stack.html. Accessed 18 Feb. 2017.

An article about Google Spanner

www.wired.com/2012/11/google-spanner-time

Metz, Cade. “Exclusive: Inside Google Spanner, the Largest Single Database on Earth.” Wired, Conde Nast, 26 Nov. 2012, www.wired.com/2012/11/google-spanner-time/. Accessed 18 Feb. 2017.

Hadoop shuffle phase

Cite from http://www.cnblogs.com/edisonchou/p/4298423.html

“Edison Chou.” Hadoop学习笔记-10.Shuffle过程那点事儿 - Edison Chou - 博客园, www.cnblogs.com/edisonchou/p/4298423.html.

The difference between String, StringBuffer and StringBuilder

Cite from http://blog.csdn.net/kingzone_2008/article/details/9220691

“Java：String、StringBuffer和StringBuilder的区别.” Java：String、StringBuffer和StringBuilder的区别 - __kingzone__的专栏 - 博客频道 - CSDN.NET, blog.csdn.net/kingzone_2008/article/details/9220691.

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