복제 연습

Provide the ability to create a deep clone of a Solution object. The data in the users map should also be cloned. Don't forget about the equals and hashCode methods needed to correctly add User elements to the HashMap.

The Plant class should not implement the Cloneable interface Implement deep cloning for Tree.

Allow cloning of the A class. Prevent cloning of the B class. Allow cloning of the C class. Don't forget about the equals and hashCode methods!