public static void main(String[] args) { Building b = new Building(); b.area = 1000; b.location = "Hrasnicka 17"; b.population = 1000; University u = new University(); u.area = 500; u.location = "Butmirska 100"; u.population = 1200; u.name = "IUS"; u.isItPublic = false; u.numberOfFaculties = 3; u.numberOfStaff = 200; System.out.println(u.getPopulationDensity()); u.printInformation(); Hospital h = new Hospital(); h.area = 200; h.location = "Vrbanja 12"; h.population = 50; h.hasCTMachine = false; h.isItPublic = false; h.numberOfSurgeons = 20; h.numberOfBeds = 20; System.out.println(h.getPopulationDensity()); Jail j = new Jail(); j.area = 2000; j.location = "Grbavicka 12"; j.population = 1600; j.hasGym = true; j.numberOfCells = 800; j.numberOfFreeCells = 0; j.securityLevel = "Max"; System.out.println(j.getPopulationDensity()); System.out.println(j.getNumberOfOccupiedCells()); }