hotelarray.txt

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

import javax.swing.JOptionPane;

public class Hotelproject {	

   //main method
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        String hotelroomname;
        
        //declaring room number
        int roomnumber = 1;
        
        //creating room array
        String[] hotelroom = new String[11];
        
         initialise(hotelroom);   

        while ( roomnumber  < 11 )
        {
        	
        	//invoking user menu
        	System.out.println("\n");
        	System.out.println("*************************************");
        	System.out.println("Welcome to hotel Amaya Reef");
        	System.out.println("*************************************");
        	System.out.println("Enter your Selection");      
        	System.out.println();
        	System.out.println("E: Display empty rooms");
			System.out.println("D: Delete customer from room");
			System.out.println("S: Store data");
			System.out.println("L: Load program");
			System.out.println("O: Sort customers");
			System.out.println("A: Add customer to a room");
			System.out.println("V: View all rooms");
			System.out.println("X: Exit the program");

			//getting user input for method executions
            String inputletter = input.next();
            
            //Display - empty rooms
          if (inputletter.equalsIgnoreCase("E")){
        	  System.out.println("Displaying Empty rooms :");
                 for (int x = 1; x < 11; x++ ){
                	 if (hotelroom[x].equals("-"))System.out.println("Room " + x + " is EMPTY");
                 }
          }
          
          //adding customer to room
          if (inputletter.equalsIgnoreCase("A")){
          System.out.println("Enter room number (1-10) or Q to exit the program:" );
          roomnumber = input.nextInt();
          System.out.println("Enter a customer name " + roomnumber +" :" ) ;
          hotelroomname = input.next().toUpperCase();
          hotelroom[roomnumber] = hotelroomname;
          }
          
          //removing customer from room
          if (inputletter.equalsIgnoreCase("D")){
          System.out.println("Enter room number to delete the customer: (1-10)" );
          roomnumber = input.nextInt();
          hotelroom[roomnumber] = "-" ;
          System.out.println("System Updated");
          }
          
          //find room
          if (inputletter.equalsIgnoreCase("F")){
               find(hotelroom);
          }
          
          //program exit
          if (inputletter.equalsIgnoreCase("X")){
              System.out.println("Thank you for usuing our program");
               System.exit(0);
          }
           
          //view all rooms
          if (inputletter.equalsIgnoreCase("V")){
        	  System.out.println("View All Rooms :");
              for (int x = 1; x < 11; x++ ){
            	  if(hotelroom[x] != "-"){
            		  System.out.println("Room " + x + " occupied by " + hotelroom[x]);
            }else{
        	   System.out.println("Room " + x + " is EMPTY");
           }
          }              
         }
          
          //store room data
         if (inputletter.equalsIgnoreCase("S")){
              storedata(hotelroom);
         } 
         
         //load room data from file
         if (inputletter.equalsIgnoreCase("L")){
             loaddata(hotelroom);
        } 
         
         //arrange rooms in order
        if (inputletter.equalsIgnoreCase("O")){
               alphabaticalorder(hotelroom);
          }
          
        }
    }
    

//method for arrange rooms in order
private static void alphabaticalorder(String hotel[]) 
    {
        List<String> orderedrooms = new ArrayList<>();
	String temp;
	
	//sorting rooms
	for (int i = 0; i < 11; i++) 
        {
            for (int j = i + 1; j < 11; j++) 
            {
		if (hotel[i] != null) 
                    {
			if (hotel[i].compareTo(hotel[j]) > 0) 
                            {
				temp = hotel[i];
				hotel[i] = hotel[j];
				hotel[j] = temp;
                            }
                    }
            }

	}
	
	//displaying the result
	System.out.println("Names in alphabetical order : ");
	for (int i = 0; i < 11 - 1; i++) 
        {
            if (hotel[i] != null) 
            {
                if (!hotel[i].equals("-")) 
                {
		orderedrooms.add(hotel[i]);
		}
		

        }
	}
	orderedrooms.add(hotel[(11) - 1]);
        orderedrooms.stream().forEach((name) -> 
            {
            System.out.println(name);
            }
            );
    }

//initialization
private static void initialise( String hotelRef[] ) {
	for(int x = 1 ; x < 11 ; x++){            
		hotelRef[x] = "-"; 
        }
}

//find room method
 private static void find(String hotel[])
    {
    try
        {
            Scanner input = new Scanner(System.in);   
            System.out.println("Enter customer name for room:" );
            String consumersname;
            consumersname = input.next();  //stores name they enter as consumers name
            for (int x = 1; x < 11; x++ )
            {
            	//prompting the result
                if (hotel[x].equalsIgnoreCase(consumersname))
                   System.out.println("Room " + x + " is occupied by "+hotel[x]);
            }
        }
        catch (Exception e )
        {
        	//prompt for wrong input
            JOptionPane.showMessageDialog(null, "The input is wrong Please enter again.");
        }   
    }
       
 //method for storing in to a file
 public static void storedata(String hotelroom[])
    {
	 try { 
         PrintWriter print = new PrintWriter("hotelReception.txt");  //file location             
         if(hotelroom.length <= 0){                
      	   System.out.println("No records to write!");                
      	    
         }             
         for (int i=1; i<hotelroom.length ; i++){               
      	   print.println(hotelroom[i]);  //printing the room data to the file            } 
         }
         print.close(); 
     } 
	 //exception handling
     catch (Exception e) 
      { 
          e.printStackTrace(); 
          System.out.println("File Not Found Exception!"); 
      } 
	 System.out.println("Data Saved Successfully");
		
	}
 
 //method for loading data from file
 private static void loaddata(String[] hotelroom) {
	 System.out.print("Load program data back from the file into the array.");
		System.out.println();
		
		File hotelfile = new File("hotelReception.txt");
		BufferedReader br = null;
		FileReader fr = null;
		
		try{
			fr = new FileReader(hotelfile);
			br = new BufferedReader(fr);

			String sCurrentLine;

			br = new BufferedReader(new FileReader(hotelfile));

			while ((sCurrentLine = br.readLine()) != null) {
				System.out.println(sCurrentLine);
			}
		}catch (IOException e) {

			e.printStackTrace();

		} finally {

			try {

				if (br != null)
					br.close();

				if (fr != null)
					fr.close();

			} catch (IOException ex) {

				ex.printStackTrace();

			}
		}
 	}
        
        
    }
    

hotelprogram.txt
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