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.
See the code in RoomCounter.java.
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