Overview: COVID-19 cases have been increased in the last period. As a result, Ministry of Health has decided to make a simple application to keep track of all citizens and their vaccination status. In this TMA, it is required to help the Ministry implement the required application. Requirements: After a quick meeting with the employee in charge, you got the following information: 

 It is required to store the whole data in one collection 

 Each citizen has a unique civil ID number (national number), name and other attributes (add at least 2 attributes from your choice). In addition, it is required to store information about all doses taken by the citizen. 

 For each dose, the following information should be stored: manufacturer, when and where has been taken, and information about the health professional who gave it. 

 Each health professional has a unique civil ID number, name, and it is required to store his/her experience (in years). Moreover, you have been informed that the following operations happen frequently: 

 Adding a new citizen to the list 

 Adding a new dose to a specified citizen 

 Retrieving number of fully vaccinated persons (who toke at least 2 doses) 

 Saving all the data into a text file after sorting them according to Civil ID. 

Analysis: Q1: There are common attributes and methods between citizen and health professional. What is the best choice for designing and writing the codes of these two classes? Explain your answer. 

Q2: Draw a simple class diagram showing only relationships between the classes. Implementation: After analysing the given requirements, implement the required application: 

 with Object Oriented Programming style 

 following the rules of good programming style (e.g. adding comments, etc.) 

 using only the material covered in M251 (and its prerequisites) 

Hints:  For each class, it is required to implement constructors, setters, getters, toString() method, and any other necessary method 3 

 If the user tries to do an operation that could violate the state of objects, the operation should be ignored and the application should display an error message (e.g. adding a citizen twice to the list, etc.)  Checking equality of any 2 objects should be done via the equals() method 

 There is a class that will do the main job of the application as follows: o It has one collection to store the whole data (all citizens) o It has static methods, one for each operation happens frequently o When you add a citizen to the list, a message should be displayed to the user to explain the status of the operation (i.e. if it was successful or not) Testing: After implementing the required classes, design and implement a testing class to test them as follows: 

 Add at least 7 citizens to the collection that stores the whole data 

 Add 1, 2 and 3 doses to different citizens and keep some citizens unvaccinated 

 Try to violate the state of the objects and show that your code prevents all violations. 

 Show that the other operations that happen frequently are working fine 

 At the end, the whole data should be saved into a text file and this file should be saved automatically inside the folder contains your Java project

Answer rating: 100% (QA)

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