OOP examples in Java

Try to extend the examples in the following way.

Users can now participate in a loyalty program, where they are allowed to collect points. For each 100 points, a user gains 1% discount on the price of a product. The maximum discount cannot be greater than 7%. Update existing source code to deal with this new requirement. Update the main method to demonstrate the new behavior.

Revisit the main method in order to properly deal with possible exceptions.

Update the DrawingMain method to print the aligned lines. Find and fix any bugs, if any.

Create a new package ex05 that revisits the Drawing functionality to support Lines, Arrows and Shapes in a uniform manner. The new Drawing should allow users to both select and deselect its elements and also clean up the selection. Finally, the new Drawing should be Iterable (that is, provide an iterator for all its elements).