OOP child's play: Day 4

[ratulMahjabin]

Overview

Tom and his friend Jerry were discussing about a concept of OOP. At that moment Jerry drew a class diagram indicating the concept they were talking about.

Then Jerry asked Tom to find out the problem.

Task

Find out the problem of the diagram and give a better solution in any programming language.

Notes

As the mentioned methods are abstracted, you are not asked to implement them.

Reminders

• ^{React to the problem if you find it interesting and helpful. This will help others to easily identify good problems to solve.}
• ^{Feel free to comment about the problem. Is the description unclear? Do you think it is too easy or too difficult than what is mentioned? Comment about it.}
• ^{Discussion about the solution is OK. But do not paste a solution here. Give a link to the solution instead.}
• ^{Do you have an interesting problem? Post it.}