Choose the correct answer :Which statement describes the semantics of a Property that has the aggregation kind composite9
Answer(s): C
In UML, the aggregation kind 'composite' is one of the two types of aggregation, shared and composite. Composite aggregation, also known as composition, implies that the composed objects do not have a separate lifecycle from the owner object and are parts of the whole. This is in contrast to shared aggregation (aggregation), where the parts can be shared with different owners and have their own lifecycle.Let's look at the options:A . Composite aggregation implies ownership and is related to, but not equivalent to namespace containment. Namespace containment is more about the scope for named elements rather than lifecycle management.B .While it's true that instances of the composed object's type are often associated only with the composite object, the key aspect of composite aggregation is not just the exclusive context but the lifecycle dependency, which is not captured in this option.C . This option is correct because, in UML, composite aggregation (composition) implies that the parts are existentially dependent on the whole.When the composite (whole) object is destroyed, so are all of its parts, indicating a strong lifecycle dependency between the composite object and its composed parts.D . This option describes a relationship more akin to set theory than UML composition. In UML, composite aggregation doesn't deal with subsets and unions in the context of set theory.Thus, the most accurate answer, according to the UML specification regarding composite aggregation, is C: When the Property's composite object ceases to exist, all of its composed objects also cease to exist.
Choose the correct answer :Consider the following diagram:According to the diagram, which statement describes the property db?
Answer(s): B
In UML, a static property is one that belongs to the class itself rather than any instance of the class. In UML diagrams, static properties are denoted by underlining the property name.Now, let's review the options:A . There is no UML notation in the diagram that specifies whether the property db is a primary key. Primary keys are a database concept and UML does not have a standard way to denote them.B . The property db is underlined, which indicates that it is a static property. This is the correct UML notation for depicting a class-level attribute.C . There is no indication in the diagram that db is inherited from a superclass. Inherited properties typically are not underlined (unless they are also static), and there is no superclass shown in the diagram.D . Underlining in UML does not signify importance or emphasis by the modeler, it indicates that a property is static.Therefore, the answer is B: The property db is a static property. This is based on standard UML notation as outlined in the UML 2.5 Specification by the Object Management Group (OMG), which dictates that static members (attributes or operations) are underlined in class diagrams.
Choose the correct answer :Which diagram shows inherited properties?A)B)C)D) Inherited properties cannot be shown In a specialized class.
In UML, inherited properties are those attributes that are defined in a superclass and inherited by a subclass. According to UML notation, when a subclass inherits from a superclass, it inherits all the attributes and operations of the superclass unless they are redefined.Let's examine each option:A . In Option A, the Customer class shows the attributes name and address repeated from the Person class. This is not necessary in UML to show inheritance and could imply these are different attributes that happen to have the same name.B . In Option B, the attributes of the Person class are not shown in the Customer class. This is correct as UML assumes that all attributes and operations are inherited by the subclass, and there is no need to repeat them unless they are overridden or extended. In this case, the diagram shows inheritance correctly without redundant representation of inherited properties.C . In Option C, the inherited properties name and address are explicitly marked as inherited.While it's possible to show inherited properties in this way for clarity, it's not necessary and is less common in standard UML class diagrams.D . Statement D is incorrect because inherited properties can be shown in a specialized class, although it is not a requirement to do so for the properties to be inherited.Based on the UML 2 Foundation specification, the correct way to depict inheritance without redundantly listing inherited attributes is shown in Option B.
Choose the correct answer :Which elements in the diagram are Features of the Car class?
Answer(s): D
In UML, the features of a class are the combined set of attributes (properties) and operations (methods) that are defined for that class. A feature is a characteristic that classifiers (like classes) can possess. In the context of UML, operations are considered behavioral features, while attributes are considered structural features.Let's analyze the given options in the context of the Car class:A . "drive()" is an operation (method) of the Car class, but "Car" itself is the name of the class, not a feature.B . "stop()" is an operation of the Car class, but "driver" is a role name for an association, not a feature of the Car class.C . "name" is an attribute of the Person class, not the Car class. "stop()" is indeed an operation of the Car class.D . "drive()" and "stop()" are operations of the Car class. "Person" is not a feature of the Car class, but no attributes of the Car class are shown in the diagram, and since features include both operations and attributes, the correct answer from the available options is D. It is understood that operations of a class are features, so the answer includes both operations of the Car class: "drive()" and "stop()". According to the UML 2 Foundation specification, both structural features (attributes) and behavioral features (operations) are considered features of a class, so the correct answer would be the operations "drive()" and "stop()" since those are the only features explicitly represented in the Car class in the diagram.
Choose the correct answer :Which statement is correct regarding Enumeration Literals?
Answer(s): A
Enumeration literals in UML are used within an enumeration to define a set of named constants.According to the UML specification:A . This statement is correct. Enumeration literals are indeed immutable, which means once they are defined within an enumeration, their values cannot be changed.B . Enumeration literals cannot be anonymous; they must be named so that they can be referenced unambiguously within the model.C . Enumeration literals can be compared for equality. In fact, this is one of their primary uses, to allow for comparison between different values of an enumerated type to determine if they are the same.D . Enumeration literal names must be unique within their enumeration. They cannot appear more than once as this would cause ambiguity in references to the literals.The most accurate statement according to the UML 2 Foundation specification is A:EnumerationLiterals are immutable.
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