A system offers four service classes A, B, C and D, which differ in price tag and have a distinctive public method doA(), doB(), doC(), and doD(), respectively. These classes do share an identical public feature doCommon() method. The price attribute is private and is declared only once somewhere to be shared by all service classes. To use the system, a selected service is first paid for and the corresponding object is created to run the distinctive method and then the doCommon() method. Show the UML class diagram for the system. Extra interfaces, classes or methods can be added if needed

A system offers four service classes A, B, C and D, which differ in price tag and have a distinctive public method doA(), doB(), doC(), and doD(), respectively. These classes do share an identical public feature doCommon() method. The price attribute is private and is declared only once somewhere to be shared by all service classes. To use the system, a selected service is first paid for and the corresponding object is created to run the distinctive method and then the doCommon() method. Show the UML class diagram for the system. Extra interfaces, classes or methods can be added if needed

EBK JAVA PROGRAMMING

9th Edition

ISBN:9781337671385

Author:FARRELL

Publisher:FARRELL

Chapter11: Advanced Inheritance Concepts

Section: Chapter Questions

Problem 3PE

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A User class has an association link to a Service class, and calls its compute() method to do mathematical calculations. Because the computation takes time, it is better to first prompt a waiting message, which was not yet provided, to inform the user. However, the Service class is also used by other internal classes that do not need the message. Therefore, your job is to come out a way to provide the message without modifying the association relationship and the code of the Service class. What design pattern is a useful choice? Also,Show the new design in UML class diagram. Extra interfaces or classes can be added.
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