nullpointerexception - Java Null Pointer Exception when creating new instance of class -

I am in the first year of my computer science and I am having a hell of time with a project. I was given the code which lists the number of rooms through an array, and I am preparing a method that allows the user to choose a room, enter his information and reserve the room.

I lie in making this issue that actually protects the room ... which is as follows ...

  Public Zero Booker (Cell [] Room, int nooforms) {// Get settings for the room (smoking, occupied, guest's name / number) displayrooms.info (rooms, numbersoforms); Room Room 1 = New Room (false, false, empty, null, numberoffrooms); // User Input, store each value in the temporary variable Scanner scan = new Scanner (System.in); System.out.println ("Please choose a room"); Int guestRoomNum = scan.nextInt (); room1.setRoomNumber (guestRoomNum); // set room [i] captured = true; Room1.setOccupied (true); // set room [i] guestname name system.out.println ("enter guest name"); String Dictit = Scan. Nxt (); String [] nameList = {dickshit}; Room1.setGuestName (nameList); // set room [i] guest.number to phone System.out.println ("Enter guest phone number"); String Phone Input = Scan. Nxt (); Room1.setGuestPhone (phoneInput); }   
 I'm getting an empty indication exception on the cell <1> new cell (false, false, empty, empty, orphosum);   
 This is the line where I should actually create an example of a custom class that was provided to me.  
 The cell class code is as follows:  
  
  Public square room {Private boolean smoking; Private boolean capture; Private string [] guestName = new string [4]; Private string guestphone; Private int room number; Public room (boolean smoking, boolean occupation, string [] guest name, string guest phone, int room number) {this.smoking = smoking; This.occupied = Captured; For (Int i = 0; I  ++) this .guestName [i] = guestName [i]; This.guestPhone = guestPhone; This.roomNumber = roomNumber; } Public Zero setGuestName (string [] guestName) {for (int i = 0; i <4; i ++) this.guestName [i] = guestName [i]; } Public string [] getGuestName () {string [] tempGuestName = new string [4]; TempGuestName for (int i = 0; i   
}   
 
 
 This is because your  in the cell ()  constructor, you are doing this.  
 For  (int i = 0; i <4 ; I ++) This .guestName [i] = guestName [i];   
 But for the  guestName  as the parameter  null , which is your  guestName  array  zero .  
 If you want to pass a  zero  So remove the  look  from the constructor. If not, pass the constructor blank  string [] .  
  room cell 1 = new room (false, false, new string [4], empty, numberoffooms);   
 Note that whenever you specify above, each element in  string []  is still a  null  reference and you It is necessary to start them explicitly later in their program.