UML diagrams are used by Software Designer to model the classes for an application which are then used by developers to develop the program codes. The diagrams can also be used by many UML modeling tools to automatically generate program codes known as reverse code engineering.
Abstract classes, concerate classes and interfaces are represented in a rectangle with their names in boldface. Abstract classes are italicized. Interfaces are prefaced by the word interface between guillemet characters.
Generalization describes a is-a relationship where a class allows its more general attributes and operations to be inherited. Let's say classN inherits from classM, then it is said classN is-a classM. The generalization class relationship is displayed with a solid line and a closed arrowhead.
Realization is the general principle of implementing an interface. For example, classM implements the InterfaceZ interface. The realization relationship is displayed with a dotted line and a closed solid arrowheard.
Attributes or member variables defines the state of a class. The attributes section is optionally displayed under the name class diagram's name section. The simplified attributes format is visibility variable_name : type = default_value where all fields are optional except for variable_name.
Operations or member functions defines the behaviour of a class. The operations section is optionally displayed displayed under the class diagram's attributes section. The simplifield operations format is visibility method_name parameter0list : return-type where all fields are option except for method_name.
4 Types of Visibility Modifiers as Described in UML:- public + (plus sign)
- private - (minus sign)
- protected # (pound sign)
- package-private ~ (tilde sign)
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