UML Class Diagram

Sun, 01 Oct 2023 10:12:00 +1200

Class diagrams are part of UML (Unified Modeling Language), which is a standardized graphical representation for specifying, visualizing, constructing, and documenting the artifacts of software systems. In class diagrams, various types of arrows are used to depict relationships between classes.

It’s kind of boring, business-like stuff, but it’s important to know the basics of UML class diagrams. They are used in many places, including design documents, code reviews, and technical interviews. Any complex system should probably be documented with UML diagrams, but for small projects, it’s usually enough to have a basic understanding of class diagrams.

Aggregation vs Composition in UML

Tue, 12 Sep 2023 10:12:00 +0530

In object-oriented design and programming, the concepts of aggregation and composition are used to establish relationships between classes. These relationships are often depicted in UML (Unified Modeling Language) diagrams and implemented in programming languages like Java. Let’s delve into both concepts and see how they differ.

UML Representation #

Aggregation: In UML, an aggregation relationship is depicted by a hollow diamond at the parent class end, pointing towards the child class.
Composition: In UML, a composition relationship is depicted by a filled diamond at the parent class end, pointing towards the child class.

Java Representation #

In Java, both aggregation and composition can be implemented by using instance variables that refer to other objects.

OOP on Andy Foster

UML Class Diagram

Aggregation vs Composition in UML

UML Representation #

Java Representation #