Question

Use the code below as the basis for a hotel reservation system (HRS). The customer calls the hotel front desk to book a room. The front desk is running your software on one of its computers. The basic operations available are:

1. book one room,
2. book two adjoining rooms,
3. list all unoccupied rooms,
4. list all occupied rooms,
5. help lists information about available methods,
6. report percent of hotel rooms that are unoccupied,
7. quit the system (shut the system down).

The people at the front desk choose a particular operation, typically in response to a phone call.

Start by modularizing the existing program code below as follows. Create a method from the welcome message (and call this new method from main). Next, create a method from the end message (and also call it from main). Finally, create a method from the help information (and call from main too).

Now we'll implement the methods of the HRS. A new method, bookOneRoom, should randomly book one room when 'b' or 'B' is pressed. Once a room is chosen, it should call bookARoom to indicate that the room is now booked. A new method, bookTwoRooms, should randomly book two rooms when '2' is pressed. It should call bookARoom (twice). Also, write a method that lists (prints out) the room numbers of all of the unoccupied rooms (when the user presses 'l' - lowercase L). Similarly, write a method that lists (prints out) the room nummbers of all of the occupied rooms (when 'L' is entered). Finally, write a method that reports the percentage of the hotel rooms that are unoccupied. This method should use the existing occupiedCount method.

Note: Every method should be preceeded by a comment that explains what the method does.

Summary of what to submit:

A properly commented, indented, and working program.

/*
file:      HRS.java
author:    < your-name-here >
desc.:     Hotel Reservation System (HRS)
*/
import  java.util.Scanner;

class HRS {

    final static int      N = 101;
    final static boolean  Occupied = true;
    //------------------------------------------------------------
    //program initialization
    static void initialize ( boolean[] rooms ) {
        for (int i=0; i<rooms.length; i++)
            rooms[i] = !Occupied;
    }
    //------------------------------------------------------------
    //book a particular room
    static void bookARoom ( int rm, boolean[] rooms ) {
        assert( rooms[rm] == !Occupied );  //cause boom if bad
        rooms[ rm ] = Occupied;
    }
    //------------------------------------------------------------
    //determine how many rooms are occupied in our hotel
    static int occupiedCount ( boolean[] rooms ) {
        int  count = 0;
        for (int i=1; i<rooms.length; i++) {
            if (rooms[i])    ++count;
        }
        return count;
    }
    //------------------------------------------------------------
    //it all starts here
    public static void main ( String[] args ) {
        //say hello
        System.out.println();
        System.out.println( "Welcome to HRS (Hotel Reservation System)." );
        System.out.println();

        boolean[]  hotel = new boolean[ N ];
        initialize( hotel );
        Scanner  kbd = new Scanner( System.in );
        boolean  timeToQuit = false;
        while (!timeToQuit) {
            //prompt for and read a command
            System.out.print( "HRS --> " );
            String  command = kbd.nextLine();

            //process the command
            if (command.equalsIgnoreCase("q")) {
                timeToQuit = true;
            } else if (command.equals("?")) {
                System.out.println();
                System.out.println( "Enter..." );
                System.out.println( "    2     to book two adjoining rooms" );
                System.out.println( "    b/B   to book a single room" );
                System.out.println( "    l     to list all unoccupied rooms" );
                System.out.println( "    L     to list all occupied rooms" );
                System.out.println( "    h/H/? for help" );
                System.out.println( "    p/P   for percent unoccupied" );
                System.out.println( "    q/Q   to quit" );
                System.out.println();
            } else {
                System.out.println( "    Please enter a valid command." );
            }
        }

        //say goodbye
        System.out.println();
        System.out.println( "Thanks for using HRS!" );
        System.out.println();
    }
}

Answer 1

//Java code

/*
file:      HRS.java
author:    < your-name-here >
desc.:     Hotel Reservation System (HRS)
*/
import java.util.Random;
import  java.util.Scanner;

class HRS {

    final static int      N = 101;
    final static boolean  Occupied = true;


    //------------------------------------------------------------
    //program initialization
    static void initialize ( boolean[] rooms ) {
        for (int i=0; i<rooms.length; i++)
            rooms[i] = !Occupied;

    }
    //------------------------------------------------------------
    //book a particular room
    static void bookARoom ( int rm, boolean[] rooms ) {
        if( rooms[rm] == !Occupied ) //cause boom if bad
        {
            rooms[rm] = Occupied;
            System.out.println("Room No."+(rm+1)+" has been booked successfully");
        }
        else
        {
            System.out.println("Room is already occupied");
        }
    }
    //------------------------------------------------------------
    //determine how many rooms are occupied in our hotel
    static int occupiedCount ( boolean[] rooms ) {
        int  count = 0;
        for (int i=1; i<rooms.length; i++) {
            if (rooms[i])    ++count;
        }
        return count;
    }

    /**
     * Print Welcome Message
     */
    private static void welcomeMessage()
    {
        System.out.println();
        System.out.println( "Welcome to HRS (Hotel Reservation System)." );
        System.out.println();
    }

    /**
     * Print the display message
     */
    private static void endMessage()
    {
        System.out.println();
        System.out.println( "Thanks for using HRS!" );
        System.out.println();
    }

    /**
     * help function
     */
    private static void help()
    {
        System.out.println();
        System.out.println( "Enter..." );
        System.out.println( "    2     to book two adjoining rooms" );
        System.out.println( "    b/B   to book a single room" );
        System.out.println( "    l     to list all unoccupied rooms" );
        System.out.println( "    L     to list all occupied rooms" );
        System.out.println( "    h/H/? for help" );
        System.out.println( "    p/P   for percent unoccupied" );
        System.out.println( "    q/Q   to quit" );
        System.out.println();
    }

    /**
     *  bookOneRoom, should randomly book one room when 'b' or 'B'
     *  is pressed. Once a room is chosen,
     *  it should call bookARoom to indicate that the room is now booked.
     */
    private static void bookOneRoom(boolean[] rooms)
    {
        Random  random = new Random();
        int randomRoom = random.nextInt(100);
        bookARoom(randomRoom,rooms);

    }

    /**
     * A new method, bookTwoRooms, should randomly book
     * two rooms when '2' is pressed. It should call bookARoom (twice).
     */
    private static void bookTwoRooms(boolean[] rooms)
    {
        bookOneRoom(rooms);
        bookOneRoom(rooms);
    }

    /**
     *  write a method that lists (prints out) the room numbers of all of the
     *  unoccupied rooms (when the user presses 'l' - lowercase L).
     */
    private static void listAllUnoccupiedRooms(boolean[] rooms)
    {
        for (int i = 0; i <rooms.length ; i++) {
            if(!rooms[i])
            {
                System.out.println("Room No.: -> "+(i+1)+" is not occupied." );
            }
        }
    }

    /**
     *  lists (prints out) the room nummbers of
     *  all of the occupied rooms (when 'L' is entered).
     */
    private static void listAllOccupiedRooms(boolean[] rooms)
    {
        for (int i = 0; i <rooms.length ; i++) {
            if(rooms[i])
            {
                System.out.println("Room No.: -> "+(i+1)+" is occupied." );
            }
        }
    }

    /**
     * method that reports the percentage of the hotel rooms that are unoccupied.
     */
    private static void getPercentageOfUnoccupiedRooms(boolean[] rooms)
    {
        int occ = occupiedCount(rooms);
        int unOcc = N-occ;
        double per = (unOcc/(double)N)*100;
        System.out.println("% of unoccupied rooms: "+ String.format("%.2f",per)+"%");
    }
    //------------------------------------------------------------
    //it all starts here
    public static void main ( String[] args ) {
        new HRS();
        //say hello
       welcomeMessage();

        boolean[]  hotel = new boolean[ N ];
        initialize( hotel );
        Scanner  kbd = new Scanner( System.in );
        boolean  timeToQuit = false;
        while (!timeToQuit) {
            //prompt for and read a command
            System.out.print( "HRS --> " );
            String  command = kbd.nextLine();
            switch (command)
            {
                case "H":
                case "h":
                case "?":
                    help();
                    break;
                case "Q":
                case "q":
                    timeToQuit = true;
                    break;
                case "2":
                    bookTwoRooms(hotel);
                    break;
                case "b":
                case "B":
                    bookOneRoom(hotel);
                    break;
                case "l":
                    listAllUnoccupiedRooms(hotel);
                    break;
                case "L":
                    listAllOccupiedRooms(hotel);
                    break;
                case "P":
                case "p":
                    getPercentageOfUnoccupiedRooms(hotel);
                    break;
                    default:
                        System.err.println("ERROR!!! ... Please enter a valid choice..");
                        break;
            }

          /**
           //process the command
            if (command.equalsIgnoreCase("q")) {
                timeToQuit = true;
            } else if (command.equals("?")) {
               help();
            } else {
                System.out.println( "    Please enter a valid command." );
            }

           */
        }

        //say goodbye
       endMessage();
    }
}

//Output

//If you need any help regarding this solution ....... please leave a comment ......... thanks