A\u00a0use case diagram<\/b>\u00a0is a graphical depiction of a user’s possible interactions with a system. A use case diagram shows various use cases and different types of users the system has and will often be accompanied by other types of diagrams as well. The use cases are represented by either circles or ellipses. The actors are often shown as stick figures.<\/p>\n While a\u00a0use case<\/a>\u00a0itself might drill into a lot of detail about every possibility, a use-case diagram can help provide a higher-level view of the system. It has been said before that “Use case diagrams are the blueprints for your system”.<\/sup><\/p>\n Due to their simplistic nature, use case diagrams can be a good communication tool for\u00a0stakeholders<\/a>. The drawings attempt to mimic the real world and provide a view for the\u00a0stakeholder<\/a>\u00a0to understand how the system is going to be designed. Siau and Lee conducted research to determine if there was a valid situation for use case diagrams at all or if they were unnecessary. What was found was that the use case diagrams conveyed the intent of the system in a more simplified manner to\u00a0stakeholders<\/a>\u00a0and that they were “interpreted more completely than class diagrams”.<\/p>\n In\u00a0software engineering<\/a>, a\u00a0class diagram<\/b>\u00a0in the\u00a0Unified Modeling Language<\/a>\u00a0(UML) is a type of static structure diagram that describes the structure of a system by showing the system’s\u00a0classes<\/a>, their attributes, operations (or methods), and the relationships among objects.<\/p>\n The class diagram is the main building block of\u00a0object-oriented<\/a>\u00a0modeling. It is used for general\u00a0conceptual modeling<\/a>\u00a0of the structure of the application, and for detailed modeling, translating the models into\u00a0programming code<\/a>. Class diagrams can also be used for\u00a0data modeling<\/a>. <\/sup>The classes in a class diagram represent both the main elements, interactions in the application, and the classes to be programmed.<\/p>\n In the diagram, classes are represented with boxes that contain three compartments:<\/p>\n 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. In detailed modeling, the classes of the conceptual design are often split into subclasses.<\/p>\n In order to further describe the behavior of systems, these class diagrams can be complemented by a\u00a0state diagram<\/a>\u00a0or\u00a0UML state machine<\/a>.<\/p>\n UML provides mechanisms to represent class members, such as attributes and methods, and additional information about them like constructors.<\/p>\n To specify the visibility of a class member (i.e. any attribute or method), these notations must be placed before the members’ name:<\/sup><\/p>\n A\u00a0derived property<\/b>\u00a0is a property whose value (or values) is produced or computed from other information, for example, by using values of other properties.<\/p>\n A derived property is shown with its name preceded by a forward slash ‘\/’.<\/sup><\/p>\nApplication<\/span><\/h4>\n
Class diagram<\/h3>\n
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Members<\/span><\/h4>\n
Visibility<\/span><\/h5>\n
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\n +<\/code><\/td>\nPublic<\/td>\n<\/tr>\n \n -<\/code><\/td>\nPrivate<\/td>\n<\/tr>\n \n #<\/code><\/td>\nProtected<\/td>\n<\/tr>\n \n ~<\/code><\/td>\nPackage<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Scope<\/span><\/h5>\n