Method getMachineIDForUser

java/Chapter 10/Question10_2/Server.java:13–16

(int personID)

	}
	
	public int getMachineIDForUser(int personID) {
		Integer machineID = personToMachineMap.get(personID);
		return machineID == null ? -1 : machineID;
	}
	
	public Person getPersonWithID(int personID) {
		Integer machineID = personToMachineMap.get(personID);