面向对象程序设计MultipleChoice2.docx

Multiple-Choice Quiz 2 In a UML class diagrams representation of a class, the top, middle, and lower rectangular compartments respectively describe the of the class. attributes, methods, and constants attributes, methods, and name name, attributes, and methods name, methods, and constants UML class diagrams can describe which of the following? The internal structure of classes Relationships between classes None (b) I only (c) I and II (d) II only Consider the following UML class diagram. The diagram describes a one-to-one relationship class without methods self-containing class relationship between a subclass and a superclass Which of the following is true about association and aggregation in UML class diagrams? Association is the opposite of aggregation. Association and aggregation have no meaningful relationship. Aggregation is a special form of association. Association is a special form of aggregation. A binary association is said to exist between two classes when one class belongs to the same package as the other class an object of one class is instantiated in the same method as an object of the other class one class is a subtype of the other class an object of one class requires an object of the other class Consider the following UML class diagram. According to the diagram, which of the following statements is (are) true? ClassB is a specialization of ClassA. ClassA is a generalization of ClassC. ClassC is involved in a self-containment loop. II and III only (b) I and II only (c) I, II, and III (d) I and III only A collection typically models a relationship. many-to-many (b) zero-to-one (c) one-to-many (d) one-to-one If a class has an association with itself, then the class contains a method that calls itself its own superclass a method that calls another method within the same class an attribute that references an object of the same class An object model describes which of the following? Attributes of classes Methods of classes Relationships between classes