Class Diagram Example: GoF Design Patterns - Prototype

Description:

Prototype design pattern is one of the Gang of Four (GOF) design patterns. Prototype design pattern creates objects based upon a template of an existing objects through cloning.

Use this Prototype design pattern template and customize it to reflect your object structure. Click Use this Template to start.

What is Class Diagram?

A Class is a blueprint that is used to create Object. The Class defines what object can do. Class Diagram gives the static view of an application. Class diagrams are at the heart of UML. They are based on the principles of object orientation and can be implemented in various phases of a project. A class diagram describes the types of objects in the system and the different types of relationships that exist among them. UML Class Diagram gives an overview of a software system by displaying classes, attributes, operations, and their relationships. Class Diagram can also help to construct the code for the software application development.

Guidelines for creating Class Diagram?

  1. Identify classes
    • a. From domain analysis such as textual analysis
    • b. From CRC cards
    • c. From use case description
    • d. From sequence diagram or use case scenarios
  2. Give analysis a name and a brief description which could be done through terms and glossary
  3. Structure classes in the right places of the diagram and related them with simple relationships
  4. As the development move forward, detail the class with attributes and operations, this often done in conjunction with use case and sequence diagrams
  5. Refine the class diagram with inheritance for future reuse
  6. Elaborate the details which is helpful for implementation such as accessibility, rules, constraints and etc.
  7. Put related classes into packages to form your software architecture

Why do we need class diagrams?

  • Plan and model requirements ahead of time make implementation much easier in subsequently phases.
  • Modify class diagrams quite is easy, whereas the actual code for features.
  • Plan for a house (not a simple dog house) to have a blueprint, before grab a hammer and nail to get work done.
  • Class diagram is quite easy to understand and to be used to communicate with other stakeholders for team afford.

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