Sports Club is an organization formed in order to help its members develop interest in certain sports. Usually- members interested in the same sport are divided into groups and an expert trainer is re

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May 13, 2021

Sports Club is an organization formed in order to help its members develop interest in certain sports. Usually- members interested in the same sport are divided into groups and an expert trainer is re

Sports Club is an organization formed in order to help its members develop interest in certain sports.

Usually, members interested in the same sport are divided into groups and an expert trainer is responsible for training each group.

In this TMA, it is required to help the head of a Sports Club for kids implement application to keep track of the kids (members of the club) and the sports they are interested in.

Requirements:

After a quick meeting with the head of the sports club, you got the following information:

 It is required to store the whole data (all groups of all sports) in one collection.

 Each group has a number, a trainer and they are interested in a certain sport (e.g. football). In addition, it contains many kids with flexibility of adding and removing kids within a given

limit for the maximum number of kids who could be in the same group (where this limit is fixed and unified for all groups). Furthermore, there are other attributes (add at least 2 attributes from your choice). Group number is unique for each sport.

 Each trainer has a unique ID, a name and other attributes (add at least 3 attributes from your choice). He/she could train more than one sport.

 Each kid has a unique ID, a name and other attributes (add at least 2 attributes from your choice).

Moreover, you have been informed that the following operations happen frequently:

 Forming a new group

 Adding a kid to a specified group

 Removing a kid from a specified group

 Retrieving the average number of kids per group of a certain sport

 Displaying all groups in a format similar to the following:

sport1: groupNo1 groupNo2 groupNo3 …

sport2: groupNo1 groupNo2 groupNo3 …

where sports and groups are sorted in ascending order

 Saving all the groups into a text file Analysis:

Q1: There are common attributes and methods between kids and trainers. 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. 2

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

 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 kid to the same group twice, 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 keep tracking of the kids as follows:

o It has one collection to store the whole data (all groups of all sports)

o It has static methods, one for each operation happens frequently

o For each adding or removing operation, 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:

 Create at least 7 groups of at least 3 sports and add them to the collection that stores the

whole data then add and remove some kids from them.

 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.

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