(Solved): Implement the structure (JAVA) based on the following Domain Class Model diagram and the Sequence Di ...

Implement the structure (JAVA) based on the following Domain Class Model diagram and the Sequence Diagrams given for a Gym system designed for customers and trainers to register via a web portal:

Create a simple Java implementation based on the design. Keep it simple. This is aimed to help you understand your multiplicities in your Domain Class Model and what the Sequence Diagram means. It is only a partial implementation of the system on a very very high level of abstraction.
Usually you would not implement it at this stage since it does not include all the data. This is just of you to see what the diagram means in code.

All classes from your Domain Class Model (DMC) should be included, exactly as shown in the  DMC (OF course, you will have to add types to your attributes). Only include
the structure at this point (no methods are needed, only exactly what is in your diagram). For now, have all attributes public.