1. I can't help you, because I don't know "the object-oriented thinking described above"
2. I won't help you, because it's your homework and not mine

This is a prime example of how I see some students graduate in computer science and don't understand basic object oriented programming concepts. You need to figure this out yourself. Of course if you try and have most of it worked out but are hung up on something very specific and need help then by all means, ask questions and learn - but just asking for us to answer the entire question for you means you learn nothing and pollute the computer science world with people who can't code and can't understand basic programming principles.

Read this.

mahlerfive, you hit the nail on the head...