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Hotel Room/Part A/OccupancyInfo.java

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+import java.util.ArrayList;
+public class OccupancyInfo
+{
+  private ArrayList<Room> rooms;
+  // no two Room objects in rooms have the same room number
+
+
+  /** Attempts to check-in a new guest into a given room number. If a room exists in
+    * the database with the room number requested, and the room is unoccupied, a guest
+    * with the name given is checked-in to that room: the room is marked as occupied,
+    * and the guestName variable in the Room object is set to the name given.
+    * @param name the name of the guest attempting to check-in
+    * @param number the room number into which the guest is to be checked-in
+    * @return -1 if no room with the requested number exists;
+    *         0 if the room requested is occupied;
+    *         1 if the check-in is successful
+    */
+  public int checkIn(String name, int number)
+  {
+    /* Implement your answer to part (a) here */
+    
+    for(Room room : rooms) {
+      if(room.getNumber() == number) {
+        return room.checkInNewGuest(name) ? 1 : 0;
+      }
+    }
+    
+    return -1;
+  }
+
+
+  /* Methods for subsequent parts of this question are not shown */
+
+  /* CLASS MEMBERS FOR TESTING */
+  /* DO NOT MODIFY ANY OF THE CONSTRUCTORS OR METHODS BELOW*/
+
+  public OccupancyInfo(ArrayList<Room> r)
+  {  rooms = r;  }
+
+  public ArrayList<Room> getRooms()
+  {  return rooms;  }
+
+}

Hotel Room/Part A/Room.java

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+/* COMPLETE WORKING CLASS PROVIDED */
+/* DO NOT MODIFY THE IMPLEMENTATION OF THIS CLASS*/
+
+public class Room
+{
+  private int roomNumber;
+  private boolean occupied;
+  private String bookingName;
+
+
+  /** Attempts to check a new guest into the room. If the room is not occupied (the
+    * variable occupied is false), changes bookingName to name and sets
+    * occupied to true.
+    * Otherwise does not change the values of the member variables.
+    * @param name the name of the guest checking in as a String
+    * @return true if the check-in was successful and bookingName was changed
+    *         false otherwise
+    */
+  public boolean checkInNewGuest(String name)
+  {
+    if(occupied) return false;
+    bookingName = name;
+    occupied = true;
+    return true;
+  }
+
+
+  /** @return the room number
+    */
+  public int getNumber()
+  {  return roomNumber;  }
+
+  /** @return true if the room is occupied; false otherwise.
+    */
+  public boolean isOccupied()
+  {  return occupied;  }
+
+  public Room (int rn, boolean o, String bn){
+    roomNumber = rn;
+    occupied = o;
+    bookingName = bn;
+  }
+
+  public String toString(){
+    return roomNumber+"; "+occupied+"; "+bookingName;
+  }
+
+}

Hotel Room/Part B/OccupancyInfo.java

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+import java.util.ArrayList;
+public class OccupancyInfo
+{
+  private ArrayList<Room> rooms;
+  // no two Room objects in rooms have the same room number
+
+  /** Returns an ArrayList containing the number of every room which is not occupied
+    * in the order in which these appear in the ArrayList rooms.
+    */
+  public ArrayList<Integer> availableRoomNumbers()
+  {
+    /* Implement your answer to part (b) here */
+    ArrayList<Integer> result = new ArrayList<Integer>();
+    
+    for(Room room : rooms) {
+      if(!room.isOccupied()) {
+        result.add(room.getNumber());
+      }
+    }
+    
+    return result;
+  }
+
+  /* Methods for previous parts of this question are not shown */
+
+  /* CLASS MEMBERS FOR TESTING */
+  /* DO NOT MODIFY ANY OF THE CONSTRUCTORS OR METHODS BELOW*/
+
+  public OccupancyInfo(ArrayList<Room> r)
+  {  rooms = r;  }
+
+  public ArrayList<Room> getRooms()
+  {  return rooms;  }
+
+}

Hotel Room/Part B/Room.java

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+/* COMPLETE WORKING CLASS PROVIDED */
+/* DO NOT MODIFY THE IMPLEMENTATION OF THIS CLASS*/
+
+public class Room
+{
+  private int roomNumber;
+  private boolean occupied;
+  private String bookingName;
+
+
+  /** Attempts to check a new guest into the room. If the room is not occupied (the
+    * variable occupied is false), changes bookingName to name and sets
+    * occupied to true.
+    * Otherwise does not change the values of the member variables.
+    * @param name the name of the guest checking in as a String
+    * @return true if the check-in was successful and bookingName was changed
+    *         false otherwise
+    */
+  public boolean checkInNewGuest(String name)
+  {
+    if(occupied) return false;
+    bookingName = name;
+    occupied = true;
+    return true;
+  }
+
+
+  /** @return the room number
+    */
+  public int getNumber()
+  {  return roomNumber;  }
+
+  /** @return true if the room is occupied; false otherwise.
+    */
+  public boolean isOccupied()
+  {  return occupied;  }
+
+  public Room (int rn, boolean o, String bn){
+    roomNumber = rn;
+    occupied = o;
+    bookingName = bn;
+  }
+
+  public String toString(){
+    return roomNumber+"; "+occupied+"; "+bookingName;
+  }
+
+}