A class diagram in the Unified Modeling Language (UML) is a form of static structure diagram that illustrates a system's classes, properties, operations, and relationships between objects to explain the structure of the system.
What is the system?A system is a group of moving or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its situation, is described by its boundaries, structure, and function and shown in its functioning. Systems are the subjects of study of systems theory and other schemes sciences.
Right-click a package in the Project tool window for which you wish to generate a diagram, then choose Diagrams | Show Diagram (Ctrl+Alt+Shift+U). Select Java Class Diagram from the list that appears. A UML diagram for classes and their dependents is produced by IntelliJ IDEA.
Therefore, A class diagram in the Unified Modeling Language (UML) is a form of static structure diagram that illustrates a system's classes
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