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copied!<p>Short of solving this thing for you, here is what I would suggest you do.</p> <p>Think of each operation that needs to be performed, and then diagram the logic that needs to take place to accomplish that operation. Then, with a clear list of logical operations that need to take place to accomplish that task, think carefully about what components you can break that operation up into and where each of those sub-tasks should go. This will give you a good idea of what the class diagram should look like. Once you've diagrammed the logic, classes/methods, and implemented one part, move on to the next part. At this point, you'll probably find that something wasn't structured in a way that allows it to be reused for the next task, so refactor it (modify the structure of the code) to make it more reusable.</p> <p>For example, tackle the check-in operation. What do you need to do first? Well, first you need determine if there are any rooms available. How do you do that? You need to ask all of the rooms (by your design, if I remember correctly) if they are available. So, we can now identify that we need a method on the rooms to tell us that they are available. Maybe tackle that first. Then the checking for a free room part. That probably goes on the hotel class. You'll need to iterate over the rooms and ask them if they are free. After this, you need to decide what to do if there is a free room(s), or if there aren't any. I guess you display an error message if there aren't? If there are free rooms, you need form the check-in operation. Write that. Rinse and repeat. Before long, you'll have a functioning program.</p> <p>The important thing to remember here is that there are MANY different ways to accomplish this in an object-oriented manner. When you are just learning OO design and the basics of programming, it is important to not get too hung up on the perfect design and to dive in. Then when you are in the middle of implementing it, I'm sure you'll say 'hey, if I do it this way it will come up much better'. I like to think of this as an iterative learning process.</p>

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