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http://www.infoq.com/cn/news/2011/01/xxb-maven-3-pom-refactoring

https://my.oschina.net/findbill/blog/529001

http://blog.csdn.net/woxincd/article/details/7040944

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https://www.zhihu.com/question/21373020

blog.csdn.net/hikvision_java_gyh/article/details/8964155

droidyue.com/blog/2014/10/02/the-private-modifier-in-java