Class Diagram Example: GoF Design Patterns - Flyweight

Description:

Flyweight design pattern is one of the Gang of Four (GOF) design patterns. Flyweight design pattern facilitates the reuse of many fine grained objects, making the utilization of large numbers of objects more efficient.

This Flyweight design pattern template can be edited with Visual Paradigm Online, an online diagramming software. Click Use this Template to edit, or click Create Blank to create a new one.

What is Class Diagram?

A class diagram is primarily designed for developers to provide the conceptual model and architecture of the system being developed. A class diagram provides the overview and structure of a system in terms of classes, attributes and methods, and the relationships between different classes.

Class diagrams are at the heart of UML. A class diagram carries different information depending on the phase of the development process and the level of detail being considered. As development progresses, a class diagram moves towards the implementation domain, which is familiar to software developers. Class diagrams are a vital part of any software development project and they form the foundation of all software products.

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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