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Alright, some basic knowledge collecting from wiki, uml tutorial websites. Merely regrad this blog as a reference, when you creating/ reading some class disgram, you might wanna look at the blog for better understanding.

1. Visibility

• + public
• - private
• # protected
• ~ package

2. Relationships

Types of logical connections found on class and object diagrams.

2.1 Dependency

A sementic connection between dependent and independent model elements.

2.2 Association

A binary association

2.3 Aggregation

Has a assocation relationship

2.4 Compostion

Has a, and without parent, child will not exist

2.5 Inheritance

2.6 Realization/ Implementation

Reference

1. https://en.wikipedia.org/wiki/Class_diagram
2. https://design-patterns.readthedocs.io/zh_CN/latest/read_uml.html

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