The attributes and method names of Rectangle are hidden.The method area() of class Circle returns a value of type double.The parameter radius in Circle is an in parameter of type float.The method names of Circle are area(), circum(), setCenter() and setRadius().The attributes of Circle are radius and center.However, Event is not dependent on Window. There is an association between DialogBox and DataController.This is a generalization / inheritance relationship. Circle, Rectangle and Polygon are derived from Shape. We can interpret the meaning of the above class diagram by reading through the points as following. ~ denotes package attributes or operations.# denotes protected attributes or operations.- denotes private attributes or operations.+ denotes public attributes or operations.The +, -, # and ~ symbols before an attribute and operation name in a class denote the visibility of the attribute and operation. UML identifies four types of visibility: public, protected, private, and package. In object-oriented design, there is a notation of visibility for attributes and operations. Visibility of Class attributes and Operations given a value (or expression) we cannot find the cell of which those are attributes. ![]()
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