Here the student can exist without library, the relation between student and library is aggregation.Please help improve this article by adding citations to reliable sources.Find sources: Class diagram news newspapers books scholar JSTOR ( February 2009 ) ( Learn how and when to remove this template message ) UML diagram types.The individual classes are represented just with one compartment, but they often contain up to three compartments.
In software engineering, a class diagram in the Unified Modeling Language (UML) is a type of static structure diagram that describes the structure of a system by showing the systems classes, their attributes, operations (or methods), and the relationships among objects. It is used for general conceptual modeling of the structure of the application, and for detailed modeling translating the models into programming code. Class diagrams can also be used for data modeling. The classes in a class diagram represent both the main elements, interactions in the application, and the classes to be programmed. It is printed in bold and centered, and the first letter is capitalized. They are also left-aligned and the first letter is lowercase. In the design of a system, a number of classes are identified and grouped together in a class diagram that helps to determine the static relations between them. With detailed modeling, the classes of the conceptual design are often split into a number of subclasses. A dependency is displayed as a dashed line with an open arrow that points from the client to the supplier. A binary association (with two ends) is normally represented as a line. An association with three links is called a ternary association. An association can be named, and the ends of an association can be adorned with role names, ownership indicators, multiplicity, visibility, and other properties. There are four different types of association: bi-directional, uni-directional, aggregation (includes composition aggregation) and reflexive. Bi-directional and uni-directional associations are the most common ones. ![]() Association represents the static relationship shared among the objects of two classes. As a type of association, an aggregation can be named and have the same adornments that an association can. However, an aggregation may not involve more than two classes; it must be a binary association. Furthermore, there is hardly a difference between aggregations and associations during implementation, and the diagram may skip aggregation relations altogether. The contents of the container still exist when the container is destroyed. The aggregate is semantically an extended object that is treated as a unit in many operations, although physically it is made of several lesser objects.
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