build a simple app using scalafx

Propose a standalone system such as the following

1. Calculator

2. Scientific Calculator

3. Library Management System

4. Todo List

5. Any Personal Games

6. …

The propose system should have least four use cases. For examples: A Library Management System should have at least four following use case:

• Check In

• Check Out

• Search Book

• View Book

This system should utilize object oriented programming concept in designing and developing.