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In software engineering, a class diagram [1] in the Unified Modeling Language (UML) is a type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, operations (or methods), and the relationships among objects. The class diagram is the main building block of object-oriented modeling.
The UML notation and semantics are really geared toward computerized UML tools. A UML state machine, as represented in a tool, is not just the state diagram, but rather a mixture of graphical and textual representation that precisely captures both the state topology and the actions.
UML provides a standard notation for many types of diagrams which can be roughly divided into three main groups: behavior diagrams, interaction diagrams, and structure diagrams. The creation of UML was originally motivated by the desire to standardize the disparate notational systems and approaches to software design.
Class diagram - a type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes and the relationships between the classes. Classifier - a category of UML elements that have some common features, such as attributes or methods.
In UML notation, the conceptual model is often described with a class diagram in which classes represent concepts, associations represent relationships between concepts and role types of an association represent role types taken by instances of the modelled concepts in various situations.
Code diagrams (level 4): provide additional details about the design of the architectural elements that can be mapped to code. The C4 model relies at this level on existing notations such as Unified Modelling Language (UML) , Entity Relation Diagrams (ERD) or diagrams generated by Integrated Development Environments (IDE) .
The Executable UML method limits the UML elements that can be used in an Executable UML class diagram. An Executable UML class diagram is meant to expose information about the domain. Too much complexity in the statechart diagrams is a good indicator that the class diagram should be reworked.
The latest UML 2.5.1 specification does not explicitly define object diagrams, [4] but provides a notation for "instances" of classifiers. [4]: 126 Object diagrams and class diagrams are closely related [5] and use almost identical notation. [6] Both diagrams are meant to visualize static structure of a system.