Patients Who Need Dental Scans Are Kept In A First In First Out Queue. Assume That You Have Found An Already Developed Queue Container In A Software Library. It Provides standard Queue Operations To Insert And Remove Data (Known As Enque And Deque Respectively). However, You Need Some Specific Operations Such As Search() To Look Up A Particular Patient And showAll() To List All The Patients In The Queue. These Additional Operations Are Not Provided By The Library Unit. Which Design Pattern Would Enable You To Obtain The Additional Functionality Required By The Queue? Justify Your Answer. Supplement Your Answer With A UML Class Diagram. Coding Is NOT Required.

Question

Patients Who Need Dental Scans Are Kept In A First In First Out Queue. Assume That You Have Found An Already Developed Queue Container In A Software Library. It Provides standard Queue Operations To Insert And Remove Data (Known As Enque And Deque Respectively). However, You Need Some Specific Operations Such As Search() To Look Up A Particular Patient And showAll() To List All The Patients In The Queue. These Additional Operations Are Not Provided By The Library Unit.  Which Design Pattern Would Enable You To Obtain The Additional Functionality Required By The Queue? Justify Your Answer. Supplement Your Answer With A UML Class Diagram. Coding Is NOT Required.

Ally · Accepted Answer

Design patterns in an object-oriented programming language can be classified into three broad categories such as Creational Pattern, Structural Pattern, and Behavioral Pattern. Each of these patterns can also be subdivided into multiple design patterns. 
According to the question, some functionalities like add() and remove() are already implemented. The client requires two new functionalities search() and showAll() to be implemented later. Hence, the Adapter Pattern (structural pattern type) should be used as another interface that needs to be added using the services of the class.  
The adapter design pattern should possess the following components:

Target Interface: MyQueueAdapter class: ExtendedQueue extending two functionalities search() and showAll()Adaptee class: EDQueue providing details of all the patients who are listed in the queue.Client: DentalAdapterDemo containing the main() method to process the client's request.

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