Difference between revisions of "W2561 UML Class Diagrams"
From Coder Merlin
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** '''Class-Level''' relationships | ** '''Class-Level''' relationships | ||
*** '''Inheritance''' indicates that one of the classes is a specialized form (''subclass'') of the other (''superclass''). This is also known as an ''is a'' relationship, e.g. "a dog is a mammal". This is indicated on a diagram by drawing a line from the subclass to the superclass with a hollow triangle on the superclass end. | *** '''Inheritance''' indicates that one of the classes is a specialized form (''subclass'') of the other (''superclass''). This is also known as an ''is a'' relationship, e.g. "a dog is a mammal". This is indicated on a diagram by drawing a line from the subclass to the superclass with a hollow triangle on the superclass end. | ||
*** '''Realization''' indicates that one of the classes (the ''client'') realizes (implements) the behavior specified by the other class (the ''supplier''). This is indicated on the diagram by drawing a dashed line from the client to the | *** '''Realization''' indicates that one of the classes (the ''client'') realizes (implements) the behavior specified by the other class (the ''supplier'' or ''interface''). This is indicated on the diagram by drawing a dashed line from the client to the interface with a hollow triangle on the interface end. The interface itself has an ''<<interface>>'' tag above the "class" name. |
Revision as of 14:48, 11 April 2019
Within these castle walls be forged Mavens of Computer Science ...
— Merlin, The Coder
Research[edit]
Key Concepts[edit]
- Class Diagrams provide a means for communicating the general, static, conceptual model of an application
- Classes are represented by a box with with three compartments
- The top compartment contains the name of the class, capitalized and centered
- The middle compartment contains the attributes (properties) of the class, left-aligned in camel case
- The bottom compartment contains the operations (methods) of the class, left-aligned in camel case
- Abstract operations are indicated by using italics for the operation name
- An abstract class is indicated by using italics for the class name
- Visibility notations may be placed in front of the attributes and operations
- + indicates public access
- - indicates private access
- Scope notations may be used to specify the scope of attributes and operations
- An underline indicates classifier (static) scope
- The lack of an underline indicates instance scope
- A relationship describes logical connections between entities
- Instance-Level relationships
- Class-Level relationships
- Inheritance indicates that one of the classes is a specialized form (subclass) of the other (superclass). This is also known as an is a relationship, e.g. "a dog is a mammal". This is indicated on a diagram by drawing a line from the subclass to the superclass with a hollow triangle on the superclass end.
- Realization indicates that one of the classes (the client) realizes (implements) the behavior specified by the other class (the supplier or interface). This is indicated on the diagram by drawing a dashed line from the client to the interface with a hollow triangle on the interface end. The interface itself has an <<interface>> tag above the "class" name.