{"id":8984,"date":"2022-06-14T03:41:28","date_gmt":"2022-06-14T03:41:28","guid":{"rendered":"https:\/\/www.booksofall.com\/pl\/?post_type=product&p=8984"},"modified":"2022-06-15T05:27:06","modified_gmt":"2022-06-15T05:27:06","slug":"what-is-class-diagram","status":"publish","type":"product","link":"https:\/\/www.booksofall.com\/pl\/what-is-class-diagram\/","title":{"rendered":"What is Class Diagram"},"content":{"rendered":"

What is Class Diagram?<\/h3>\n

10-13 minutes<\/p>\n

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 system’s classes, their attributes, operations (or methods), and the relationships among objects.<\/p>\n

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Purpose of Class Diagrams<\/h3>\n
    \n
  1. Shows static structure of classifiers in a system<\/li>\n
  2. Diagram provides a basic notation for other structure diagrams prescribed by UML<\/li>\n
  3. Helpful for developers and other team members too<\/li>\n
  4. Business Analysts can use class diagrams to model systems from a business perspective<\/li>\n<\/ol>\n

    A UML class diagram is made up of:<\/p>\n

      \n
    • A set of classes and<\/li>\n
    • A set of relationships between classes<\/li>\n<\/ul>\n

      What is a Class<\/h3>\n

      A description of a group of objects all with similar roles in the system, which consists of:<\/p>\n

      Structural features (attributes) define what objects of the class “know”<\/p>\n

        \n
      • Represent the state of an object of the class<\/li>\n
      • Are descriptions of the structural or static features of a class<\/li>\n<\/ul>\n

        Behavioral features (operations) define what objects of the class “can do”<\/p>\n

          \n
        • Define the way in which objects may interact<\/li>\n
        • Operations are descriptions of behavioral or dynamic features of a class<\/li>\n<\/ul>\n

          Class Notation<\/h3>\n

          A class notation consists of three parts:<\/p>\n

          1. Class Name<\/p>\n

            \n
          • The name of the class appears in the first partition.<\/li>\n<\/ul>\n

            2. Class Attributes<\/p>\n

              \n
            • Attributes are shown in the second partition.<\/li>\n
            • The attribute type is shown after the colon.<\/li>\n
            • Attributes map onto member variables (data members) in code.<\/li>\n<\/ul>\n

              3. Class Operations (Methods)<\/p>\n

                \n
              • Operations are shown in the third partition. They are services the class provides.<\/li>\n
              • The return type of a method is shown after the colon at the end of the method signature.<\/li>\n
              • The return type of method parameters is shown after the colon following the parameter name.<\/li>\n
              • Operations map onto class methods in code<\/li>\n<\/ul>\n

                The graphical representation of the class – My Class as shown above:<\/p>\n

                  \n
                • My Class has 3 attributes and 3 operations<\/li>\n
                • Parameter p3 of op2 is of type int<\/li>\n
                • op2 returns a float op3 returns a pointer (denoted by a *) to Class6<\/li>\n<\/ul>\n

                  Class Relationships<\/h3>\n

                  A class may be involved in one or more relationships with other classes. A relationship can be one of the following types: (Refer to the figure on the right for the graphical representation of relationships).<\/p>\n","protected":false},"excerpt":{"rendered":"