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 Diagram?

Class diagrams are useful in many stages of system design:

  1. Analysis stage - a class diagram can help you to understand the requirements of your problem domain and to identify its components.
  2. Design stage - you can refine your earlier analysis and conceptual models into class diagrams that show the specific parts of your system, user interfaces, logical implementations, and so on.v
  3. Detailed design stage - the class diagrams that you create during the early stages of the project contain classes that often translate into actual software classes and objects when you write code.v
  4. Implementation stage - you can use class diagrams to convert your models into code and to convert your code into models.

Your class diagrams then become a snapshot that describes exactly how your system works, the relationships between system components at many levels, and how you plan to implement those components.

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