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Chapter 12

Chapter 12

UML Patterns

This activity contains 10 questions.

	From a pattern viewpoint, the most significant difference between merge sort and quick sort is:   Other than the fact that both algorithms sort, there's little one can say about the similarities and differences between their split and join methods Both merge sort and quick sort have similar characteristics for the split and join methods Merge sort has a simple join method, and a more complex split method; while quick sort has the opposite characteristics Merge sort has a simple split method, and a more complex join method; while quick sort has the opposite characteristics

	The characters: +, -, #, ~, as prefixes to data and methods in UML diagrams, mean:   Public, private, protected, package access Public, protected, private, static Public, private, static, dynamic Public, private, package, protected access

	What can be said about the efficiency of programs developed using the Sorting pattern? Such programs almost always are highly efficient Such programs almost always are highly inefficient The efficiency of the resulting program depends upon the specific algorithms used to implement the split and join methods The efficiency of the resulting program depends mostly upon the ordering of the data that is sorted   Only (c) is true in general Only (d) is true in general Only (b) is true in general Only (a) is true in general

	What functions do you think are common to most Container-Iterator patterns? Begin iteration Access current item Move to next item Move to previous item How many items are there? Restart iteration Stop iteration   Common functions: (a), (b), (c), (e), (g) Common functions: (a), (b), (c), (e) Common functions: All seven Common functions: (a), (b), (c), (d), (e)

	What is (are) the relationship(s) between UML diagrams and Patterns? UML diagrams provide a pictorial representation of patterns Patterns are a mechanism for implementation UML diagrams UML diagrams and Patterns are two tools which are used to facilitate the practice of programming   Both (a) and (c) Both (b) and (c) All three Only (c)

	What restriction(s) are there on the use of the Sorting pattern? The < operator must be defined The compareTo method must be defined Some way to compare all pairs of elements in the set to be sorted must be defined Either the < operator or the > operator must be defined   Only (c) Only (b) and (d) Only (a) and (d) All four restrictions

	Which of the following statements are true? UML class diagrams are connected by upward-pointing arrows, pointing towards their immediate ancestor UML class diagrams are connected by upward-pointing arrows, pointing towards their immediate successors In Java, an UML class diagram can have several upward-pointing arrows leaving from it In Java, an UML class diagram can have several upward-pointing arrows pointing to it   True statements: (a), (c) Only (a) is true True statements: (b), (d) True statements: (a), (d)

	Which of these statements is true? Since Java has but single inheritance, UML inheritance diagrams will be tree-like Since Java has but single inheritance, UML inheritance diagrams will be graph-like Since Java has multiple inheritance, UML inheritance diagrams will be tree-like Since Java has multiple inheritance, UML inheritance diagrams will be graph-like   True: (a) True: (c) True: (b) True: (d)

	Which statement(s) are correct? The Model-View-Controller pattern: Is particularly appropriate for GUIs frequently is used for sorting can provide for more than a single view almost always deals with more than a single model is an example of applying "divide and conquer" strategy to the art of design   Correct: (a), (b), (c), (e) Correct: All of the statements are true Correct: (a), (c), (d), (e) Correct: (a), (c), (e)

	Which statement(s) are true? UML and patterns are tools designed specifically for Java UML and patterns are tools designed for all general-purpose programming languages UML and patterns are tools designed for object-oriented programming languages UML and patterns are tools designed for structured programming languages   True statements: only (d) True statements: (a) and (c) True statements: only (c) True statements: only (b)

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