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Chapter 9, Problem 10E

Suppose that you are going to create an object used to count the number of people in a room. We know that the number of people in the room can never be negative. Create a RoomCounter class having three public methods:

  • addPerson—adds one person to the room
  • removePerson—removes one person from the room
  • getCount—returns the number of people in the room

If removePerson would make the number of people less than zero, throw a NegativeCounterException.

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