![]() Student id, student name, and so on are the attributes of the Student class. The Student class encapsulates student information such as student id #, student name, and so forth. A Student class represents student entities in a system. Simply put, individual members of a family of our family tree example are analogous to classes in a class diagram.Īs an example, let us take a class named Student. The properties of a class are called attributes. Apart from business functionality, a class also has properties that reflect unique features of a class. These are exposed by the class to other classes as methods. Class: A class represents an entity of a given system that provides an encapsulated implementation of certain functionality of a given entity.Elements of a Class DiagramĪ class diagram is composed primarily of the following elements that represent the system’s business entities: You will now see what the components of a class diagram are, and how to create a class diagram. However, besides use cases, the artifacts of a project, such as stakeholder requests, (signed off) requirement documents, functional specifications, and a glossary of terms for the project serve as other important inputs to the discovery of classes. Each use case is further analyzed and broken up into atomic components that form the basis for the classes that need to be designed. The aim of designing classes is to convert this “what” to a “how” for each requirement. But, how does a class diagram relate to the use case diagrams that you read about in the earlier article? When you designed the use cases, you must have realized that the use cases talk about “what are the requirements” of a system. Now you now know what a class diagram is. Class diagrams are referenced time and again by the developers while implementing the system. The structure of a system is represented using class diagrams. A thing to remember is that a class diagram is a static view of a system. Design experts who understand the rules of modeling and designing systems design the system’s class diagrams. Similarly, a software application is comprised of classes and a diagram depicting the relationship between each of these classes would be the class diagram.īy definition, a class diagram is a diagram showing a collection of classes and interfaces, along with the collaborations and relationships among classes and interfaces.Ī class diagram is a pictorial representation of the detailed system design. Interestingly, classes in a class diagram are interconnected in a hierarchical fashion, like a set of parent classes (the grand patriarch or matriarch of the family, as the case may be) and related child classes under the parent classes. The classes and interfaces in the diagram represent the members of a family tree and the relationships between the classes are analogous to relationships between members in a family tree. A class diagram consists of a group of classes and interfaces reflecting important entities of the business domain of the system being modeled, and the relationships between these classes and interfaces. Decide the inheritance of personal traits and charactersĪ UML class diagram is similar to a family tree.Determine relations among family members.Find the characteristics of each family member.Identify how they are related to each other.Identify the main members of the family.What is a UML class diagram? Imagine you were given the task of drawing a family tree. ![]() By the end of the second article, you will be able to define classes for a system and read and create class diagrams. ![]() In our next article, a sequel to this one, we will see how to create class diagrams for our case study-Courseware Management System. Now, you will learn about UML class diagrams, what the elements of a class diagram are, what each of these elements signify, and how to identify them. In the previous article, you saw what UML use cases are, and how to identify and create use cases. ![]() We may make money when you click on links to our partners. content and product recommendations are editorially independent. ![]()
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