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Jun 07, 2016 pm 04:03 PM

uml

看到UML的时候感觉它特别的高大上，有一个这么有文化的名字，还有个比较有内涵的解释：设计工具，立马有种仰视的感觉。软件工程是设计思想，而UML是设计工具，设计工具还没有开始学习，怎么会有似曾相识的感觉呢？且听我慢慢道来，首先对UML来个认识。 Unifi

看到UML的时候感觉它特别的高大上，有一个这么有文化的名字，还有个比较有内涵的解释：设计工具，立马有种仰视的感觉。软件工程是设计思想，而UML是设计工具，设计工具还没有开始学习，怎么会有似曾相识的感觉呢？且听我慢慢道来，首先对UML来个认识。

UnifiedModeling Language (UML)又称统一建模语言或标准建模语言,解剖一下UML，核心是语言，看到这里会不会想到原来学到的很多语言，SQL server（结构化查询语言）……UML是面向对象的建模语言，恩。。。面向对象，从开始学习vb就认识到的名词，难怪有似曾相识的感觉呢。

既然是面向对象的建模语言，面向对象的三个属性：封装，继承，多态是必不可少的。

封装性：对客户隐藏实现，客户仅仅看到接口，过程不重要，只要个结果。

继承关系：父子关系，最大的达到复用的功能，把父类可以继承的都继承过来。

多态性：允许将子类类型的指针赋值给父类类型的指针，父类有的子类也有，同时在父类的基础上进行了延伸。

面向对象的好处：可靠性，维护和支持性。面向对象经历了vb，软件工程，UML一直伴随着我们，而面向对象的思想无论是在vb，软件工程还是UML中都是一样的。在学习UML在UML中的面向对象中最重要的是四种关系，依赖，关联，泛化，实现。下一篇博客：UML的四种关系。

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