中山大学-系统分析与设计-系统分析与设计期末考卷（A卷）答案.pdfVIP

一、选择题（30 分） 1-5 ：A A C B A 6- 10：B A B C C 二、简答题（30 分） 1：Key Points: Design patterns aim to enhance the maintainability and extensibility of the system. And their goal is to reduce the influence of changing in requirements. You can find many examples to explain the point. UP, especially iterative process is another way to achieve this goal. 2 ： Similarity ( 1) A well-known problem/solution pair that can be applied in new contexts. Be described with the same design patterns template, include name, intent, problem，context, enforce, solution, etc. (2) Vocabulary of software designer. A way of reusing abstract knowledge about a problem and its solution Difference ( 1) Content : GRASP: General Responsibility Assignment Software Patterns, Responsibility-Driven GOF: Solution scheme is specified by describing its constituent components, their responsibilities and relationships, and the ways in which they collaborate [POSA]. The component design. (2) Abstraction Level: Low, High (3) Methods: Design principles, Component design techniques. Relations: GRASP always as a tools to explain the other design pattern. Such as components responsibility, Low coupling high cohesion. 三、作图题 1:：注意，该题有多种答案，但一定要表达CB PriceStrategy 与PD PriceStrategy 组合关系； 工厂的单实例实现概念（静态方法获得实例）。 《Create》 Register Sale 1 《interface》 * PriceStrategy makeNewSale ps 《Create》 PD PriceStrategy CB PriceStrategy PriceStrategyFactory add(priceStrategy) getSalePricingStrategy 《Create》 get