Lab Exam 2/2/2005

We want to realize a program for collecting statistical data about apartments. For each apartment, the following information is stored:

address (a string),
size (in square meters, a double),
status (free or occupied),
name of the person who lives in the aparment, in case the apartment is occupied (a string).

Part 1. Write a class Apartament that implements the following methods:

Apartament(String a, double s) : constructor that creates an object representing an appartment whose address is a, whose size is s, and which is initially free;
String getAddress() : that returns the address of the apartment;
double getSize() : that returns the size of the apartment;
String getPerson() : that returns the name of the person living in the apartment, if the apartment is occupied, and null otherwise;
boolean isFree() : that checks whether the aparment is free;
void occupy(String p) : that changes the status of the apartment to occupied and sets the name of the person living in the apartment to p; if the apartment is already occupied, the method should do nothing;
void free() : that changes the status of the apartment to free; note that when the apartment is free, the name of the person living in it is not significant;
String toString() : that returns a string with all the information about the apartment.

Part 2. Write a class UseApartment, client of Apartment, that contains the following public static method:

static double averageSizeFree(Apartment[] arc) : that, given an archive arc of apartaments, represented as an array of apartments, calculates the average size of the apartments that are free. If there are no free apartments in the archive, the method should return 0.