How would my room class get access to that hashmap? or is that a bad way of designing/thinking about the problem? Since I am not using any databases, I am storing my rooms in a HashMap where the key is the Room and the value is a Boolean indicating whether it's booked or not. I want the guest class to be able to bookRoom and for a Room to check if it isAvailable. In my main function, I create 2 Rooms and one guest.

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Book management system project in java