UML: Class Diagram (Essentials)
A class diagram describes the types of objects in the system and the various kinds of static relationships that exist among them. Class diagrams also show the properties and operations of a class and the constraints that apply to the way objects are connected.
The UML uses the term feature as a general term that covers properties and operations of a class.
The boxes in the diagram are classes, which are divided into three compartments: the name of the class (in bold), its attributes, and its operations. also shows two kinds of relationships between classes: associations and generalizations.
More specifically, each class has 3 fields: the class name at the top, the class attributes right below the name, the class operations/behaviors at the bottom.
Properties: represent structural features of a class. As a first approximation, you can think of properties as corresponding to fields in a class.
Attributes: the attribute notation describes a property as a line of text within the class box itself.
Associations: much of the same information that you can show on an attribute appears on an association. This is the same properties represented in the two different notations.
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