Choose the correct answer: A framework developer has been given a requirement to create an extensible utility for solution developers to use to create collections. The framework developer has submitted the following diagram fragment for review: Which review comment is valid and applicable?
Correct Answer: B
In UML, the «bind» relationship is used to specify that a class is a template instantiation of a template class, where actual parameters are bound to the formal parameters of the template class1. However, in the case of the relationship between a concrete class like Vector and an abstract class like AbstractList, the correct relationship should be Generalization, not «bind». Generalization is a taxonomic relationship between a more general classifier and a more specific classifier. Each instance of the specific classifier is also an instance of the general classifier1. Thus, Vector being a concrete implementation of AbstractList, should inherit from AbstractList, which is correctly represented by a Generalization relationship in UML. The other options can be evaluated as follows: * Option A: The upper limit for the size of PhontyQueue is a design decision that should be based on the requirements and use cases of the application. It is not inherently incorrect in UML to have a specific upper limit. * Option C: The Generalization relationship is correctly used between PriorityQueue and AbstractQueue as it represents inheritance in UML. * Option D: While it is true that template parameters are typically defined at the top of the hierarchy, the statement is too absolute. In UML, template parameters can be added to specialized classes, but it depends on the specific design and requirements. Therefore, without additional context, this statement cannot be deemed universally valid. In conclusion, the most applicable and valid review comment is option B, which correctly identifies the misuse of the «bind» relationship in the context of the class diagram provided.
Question 7
Choose the correct answer: A behavior A is specified by an Activity. A specialized version B of the behavior shall also be specified Which is a correct approach to model that scenario?
Correct Answer: A
In UML, a specialized behavior that is an extension or modification of a more general behavior is typically shown using the generalization relationship. Option A correctly models this scenario by showing behavior B as a specialization of behavior A, which is indicated by the containment within the package and a nesting of B inside A without any stereotype on the relationship. This representation implies that B inherits the characteristics of A while potentially adding or overriding some aspects of it. References: * UML 2.5 Specification: Generalization is defined in the UML 2.5 Specification, where a more specific classifier may override the behaviors of a more general classifier.
Question 8
Choose the correct answer: In a model of a commercial transaction, actors might exchange euros, pesos, and dollars Which figure illustrates compliant use of UML information items for these currency exchanges?
Correct Answer: B
In UML, an InformationItem represents an abstraction of all those elements in a UML model that have an information-bearing feature. It is depicted as a classifier with the keyword «informationItem». An InformationItem does not have direct instances and serves as a mechanism to handle unspecified, untyped information in a model. In the context of a commercial transaction model, currencies such as euros, pesos, and dollars can be abstractly represented as InformationItems to signify that they are used as a form of data exchange but without specifying the concrete structure or data type. Figure 2 correctly uses InformationItem notation, with the «informationItem» keyword and the directed association pointing from the Currency InformationItem to the Euro, Peso, and Dollar, which are likely representations or manifestations of the Currency. This complies with the UML specification for representing abstract entities in models that are involved in the exchange or flow of information.
Question 9
Choose the correct answer: What does the MDA approach support?
Correct Answer: C
The Model-Driven Architecture (MDA) approach is a design methodology that covers the entire software development lifecycle, from requirements to technology implementation. It emphasizes the use of models as the primary artifacts in the development process, allowing for a more abstract and high-level approach to software design. MDA supports the transformation of models from platform-independent models (PIMs) to platform-specific models (PSMs) and ultimately to code, ensuring that the initial requirements are accurately reflected in the final technology implementation. MDA is not limited to Meta Data Aspects (A) or Design and Architectural Models (B) alone, nor is it primarily about deriving models from Artificial Intelligence Systems (D). Instead, it provides a comprehensive framework that facilitates the creation of software systems by bridging the gap between business requirements and technology solutions. References: * An MDA Approach Based on UML and ODM Standards to Support Big Data Analytics1 * Improving Automatic UML2 Profile Generation for MDA Industrial Development2 * Applying 4+1 View Architecture with UML 2
Question 10
Choose the correct answer: What happens when an exception is raised by an Action within an Activity that has been invoked asynchronously?
Correct Answer: D
For asynchronous invocations in UML, when an exception is thrown and there is no matching exception handler within the activity, the exception is effectively lost because there is no direct mechanism to propagate it back to the caller. This reflects the nature of asynchronous communication where the calling process does not wait for the completion of the called process and, thus, may not be designed to handle exceptions that occur during the called process. References: * UML 2.5 Specification: The UML specification describes the behavior of actions within activities and how exceptions are handled, or not handled, in the case of asynchronous calls. It specifically states that for asynchronous calls, the exception is not propagated back to the caller as there is no return flow defined for such invocations.
