JAVA PROBLEM

A company organizes team building events. Each event has a start date, end date, price, type and location. Clients (name, email) buy events which are added to their purchases. Check when adding events that they do not overlap. Events can be sorted by their price or by their type. Clients can display their purchased events, filtered by their type. Also given the list of clients implement a method that returns Map> - where Event.TYPE is an enumeration representing the types of events. This map contains the list of clients for each type of events. You can use classes from the Collection framework in Java. The grade takes into consideration the proper use of generics, immutable classes, and the proper choice of the collection classes. Implement all classes and copy the implementation below. Make sure to correctly implement (if required) Comparable interface, hashCode and equals methods.