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C ++ notes (1)

Source: Internet
Author: User
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1. What is UML?
It is used to collect concepts and express concepts. The basis is to model the system. It is a document that establishes models in a visual manner. It can generate a set of products for delivery. There are otherProgramming Language.
2. relational expressions in UML
Associations are used to express the relationship between objects of a class and objects of another class.
Aggregation: indicates the relationship between the class and the object as a whole and between parts.
Combination: A simple aggregation relationship, indicating that the whole has a part, and the whole does not exist.
Dependency: indicates the use relationship.
Generalization: indicates the inheritance relationship.
3. activity diagram
The activity diagram is a flow chart in terms of semantics and practice.

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