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This article mainly introduces how to use UML to draw class diagrams, with a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

Using UML to draw Class Diagram Summary

Recently, I finally got an advanced one and started to draw class diagrams with UML. Generally speaking, it is helpful to sort out the ideas before coding. Some materials have been collected and sorted out in the course of use. The following mainly introduces the relationship between several classes in the UML class diagram:

1. Generalization relation

Generalization relationships usually represent inheritance relationships, and the object-oriented term is is-a relations. That means Class2 is a Class1. In C++, we say that Class2 is a derivative of Class1, or that Class1 is the base class of Class2.

two。 Aggregation and composition

When UML draws a class diagram, aggregation and composition usually represent a situation in which one class is a data member of another class, where one end of the diamond is the whole and the other end is the part.

Gathering: just like the relationship between the airport and the aircraft, the airport can have no aircraft, and the aircraft may not be at the airport.

Composition: just like cars and tires, cars must have tires, and tires do not make sense to leave the car.

3. Dependency relationship

Let's take a look at dependency relationships in UML class diagrams. Assuming that the change of class A causes the change of class B, it means that class B depends on class A.

There are three cases of dependencies:

1) Class An is a parameter in Class B methods.

2) Class A sends messages to Class B, which affects the change of Class B.

4. Association

Is the lexical connection between classes so that one class knows the public properties and operations of another class, just like # Include in C++, associations can be one-way and two-way.

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