Class Diagram Example: Car

Description:

This is a class diagram for car. It represents the components of a class as an object model. It contains classes like Gar, GearBox, Brake, Engine, Tire, etc.

Use this Class diagram template as a starting point to create your own, or click Create Blank to start from scratch.

What is Class Diagram?

Class diagrams provide a structural view of systems which capture the static structure of Object-Oriented systems, or how they are structured rather than how they behave. A class diagram supports architectural design and typically represent the basics of a Object Oriented system. It identifies what classes there are, how they interrelate and how they interact.

A class diagram carries different information depending on the phase of the development process and the level of detail being considered. For example, initially, class diagram reflect the problem domain, which is familiar to end-users. As development progresses, a class diagram moves towards the implementation domain, which is familiar to software developers.

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

When to use Class Diagram?

As a sketch:

  • Perform visual modeling rather than lengthy textual description
  • Casually use for illustrate initially ideas develop without the need of upfront requirement documentation
  • Instant revise from code to class diagram to pinpoint a specific problem
  • Used it to visual model to get rough selective ideas just in time whenever needed

As a blueprint:

  • a complete design to be implemented
  • typically done with a proper UML modeling tools

As code engineering:

  • Perform model to code forward engineering
  • Perform code to model reverse engineering
  • Keep code and model in sync by performing round-trip engineering

As data engineering:

  • Design data modeling based on detailed class diagram
  • Reverse class or object wrapper base on database
  • Use database framework such as Hibernate ORM Framework

As Web API generation

  • Generate web API based on Class Diagram such as SWAGGER

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