---
title: "UML Class Diagrams Cheatsheet"
description: "A quick reference guide to UML class diagrams and their components."
image: "https://assets.bytebytego.com/diagrams/0399-a-cheatsheet-for-uml-class-diagrams.png"
createdAt: "2024-02-22"
draft: false
categories:
  - software-architecture
tags:
  - UML
  - Design Patterns
---

![](https://assets.bytebytego.com/diagrams/0399-a-cheatsheet-for-uml-class-diagrams.png)

UML is a standard way to visualize the design of your system and class diagrams are used across the industry.

They consist of:

*   **Class**

    Acts as the blueprint that defines the properties and behavior of an object.

*   **Attributes**

    Attributes in a UML class diagram represent the data fields of the class.

*   **Methods**

    Methods in a UML class diagram represent the behavior that a class can perform.

*   **Interfaces**

    Defines a contract for classes that implement it. Includes a set of methods that the implementing classes must provide.

*   **Enumeration**

    A special data type that defines a set of named values such as product category or months in a year.

*   **Relationships**

    Determines how one class is related to another. Some common relationships are as follows:

    *   Association
    *   Aggregation
    *   Composition
    *   Inheritance
    *   Implementation