Question details

Do not include constructors, getters, or setters in your description.
$ 15.00

Pick one of the following scenarios and 

Model using at least 5 classes: one parent, two children, and two grandchildren of one of the child classes.
Provide at least one field and one method that compellingly differentiates each class from the others.
Do not include constructors, getters, or setters in your description.
Scenarios - lots of them spring to mind, but I don't want the list to be too long. In this way, you can compare your ideas with those of other students and I encourage to consider what other students have posted. You are also encouraged to make suggestions of other's postings and make additional postings updating your own ideas in light of the suggestions by others.

An airplane
A train
An e-commerce company (eg, Amazon)
A city government
An airline (aspects of an entire company)
A government organization (eg, EPA, Defense)
Note: This problem is NOT asking for a full implementation of these classes - a UML diagram, or similar level of detail, is adequate.

I would emphasize the following kinds of relationships among classes:

Is -a: parent/child relationship in a class hierarchy
perhaps better to use the phrase "is a kind of", as in "a Private is a kind of Soldier" or "a SportsCar is a kind of Car"

is-some: a data structure in which all the elements have the same type. 
This is the place where one should use generic classes.
This will not be the case in our project since we have a structure of Cave -> Party -> Creature -> Artifact and Treasure.

has-a: an attribute (field) of one class inside another

has-some: a 1-to-n relationship,
in our case a Party will have may Creatures, and a Creature will have many Artifacts and will also have many Treasures

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