UML Class Diagram

1, Inheritance relations: Hollow triangle + solid line.

2, realize the interface: Hollow triangle + dashed line.

3. Aggregation relationship: Hollow Diamond + solid arrow. Aggregation represents a weak ' owning ' relationship, which shows that a object can contain a B object, but the B object is not part of a.

4. Composition (combination) Relationship: Solid diamond + Solid line arrow. Synthesis represents a strong ' owning ', which embodies the strict part and the whole relationship, part and the whole life cycle.

5, dependence: dashed cutting head.

6. Association relationship: Solid Arrow. When a class knows another class.

UML Class Diagram