The HotelRoom class is used to store information about a hotel room. A partial HotelRoom class definition is shown.

public class HotelRoom

$l****$ The room number $*\frac{*}{?}$

private int number;

$1****$ The availability of the room, true if available $*/$

private boolean availability;

$1****$ Creates a new HotelRoom with given parameters $*/$

public HotelRoom $($int number, boolean isAvailable$)$

$\frac{?}{?}****$ Returns the availability of the HotelRoom implementation not shown $*/$

$\frac{?}{?}****$ Returns a String containing the room number and availability implementation not shown $*/$

$//$ There may be instance variables, constructors, and methods that are not shown.

You will write a class LuxurySuite, which is a subclass of HotelRoom. A LuxurySuite provides services, which is a String containing descriptions of all the additional services, and an extraCost, which is a positive double used to indicate the extra cost of the additional services.

The getRoomstatus method, when called on by a LuxurySuite, returns a String that also includes the extra cost, as shown in the example on the next page.

Information about the room number and availability must be maintained in the HotelRoom class.

The LuxurySuite class contains an additional method, changeCost, which returns a double indicating the cost of changing from a currently occupied $/$ unavailable Luxurysuite to another available HotelRoom indicated by the parameter. In any other cases, the rooms are not changeable, the method would return $0\mathrm{.}0.$ The cost of changing a LuxurySuite to a regular Hotel Room is half of the extra cost of a LuxurySuite, whereas changing a LuxurySuite to another LuxurySuite is free.

The following table contains a sample code execution sequence and the corresponding results. The code execution sequence appears in a class other than HotelRoom or LuxurySuite.

$\backslash$table$[[$Statement$,$Value Returned,Class Specification$],[\backslash$table$[[$HotelRoom $r1=$ new$],[$HotelRoom$(101,$ true$)$;$]],,r1$ is room $101$ and available.$],[\backslash$table$[[$HotelRoom $r2=$ new$],[$HotelRoom$(201,$ false$)$;$]],,\backslash$table$[[r2$ is room $201$ and it is NOT$],[$available$.]]],[\backslash$table$[[$Luxurysuite $r3=$ new$],[$LuxurySuite $("$Meal$",],[50\mathrm{.}0,301,$ true$)]],,\backslash$table$[[r3$ is room $301$ and available. It$],[$is a LuxurySuite with$],[$additional "Meal" service with$],[$an extra cost of $$50\mathrm{.}0.]]],[\backslash$table$[[$LuxurySuite $r4=$ new$],[$LuxurySuite $("$King Bed",$],[20\mathrm{.}0,401,$ false$)]],,\backslash$table$[[r4$ is room $401$ and it is NOT$],[$available$.$ It is a LuxurySuite$],[$with additional "King Bed"$],[$service with an extra cost of$],[$$$20\mathrm{.}0.]]],[$rl$.$ getRoomStatus $()$;$,"101$ is available",$\backslash$table$[[$A String indicating the room$],[$number and availability of the$],[$HotelRoom is returned.$]]],[$r$2.$ getRoomstatus$()$;$,"201$ is not available",$\backslash$table$[[$A String indicating the room$],[$number and availability of the$],[$HotelRoom is returned.$]]],[$r$3.$ getRoomStatus$()$;$,"301$ is available with extra cost $$50\mathrm{.}0",\backslash$table$[[$A String indicating the room$],[$number$,$ availability and extra$],[$cost of the LuxurySuite is$],[$returned$.]]],[$r$4.$getRoomStatus $()$;$,"401$ is not available with extra cost $$20\mathrm{.}0",\backslash$table$[[$A String indicating the room$],[$number$,$ availability and extra$],[$cost of the LuxurySuite is$],[$returned$.]]],[$r$3.$ changeCost $($r$1)$;$,0\mathrm{.}0,\backslash$table$[[$Cannot change room from $r3$ to$],[r1$ because $r3$ is not occupied.$]]],[$r$4.$ changecost $(x1$;$,10\mathrm{.}0,\backslash$table$[[$Changing a LuxurySuite to a$],[$regular available HotelRoom$],[$costs half of the extra cost of the$],[$LuxurySuite$.]]],[$r$4.$ changeCost $($r$2)$;$,0\mathrm{.}0,\backslash$table$[[$Cannot change room from $r4$ to$],[r2$ because $r2$ is occupied.$]]],[$r$4.$ changeCost $(r3)$;$,0\mathrm{.}0,\backslash$table$[[$Changing a LuxurySuite to$],[$an available LuxurySuite is$],[$free$.]]]]$