添加面试问题

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xiongraorao
2018-08-14 20:45:40 +08:00
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[源码以及 UML 图](https://github.com/CyC2018/Design-Pattern-Java)
[参考链接](https://github.com/me115/design_patterns)
# 二、创建型
## 1. 单例Singleton