package Hotel;
 
/**
 *
 * @author silentone190
 */
public class customer 
 
{   private static final double RmR = 79.95;
    private static final double TxR = 6.5;
    private static final double PhC = 5.75;
    private static final double mlC = 12.95;
    private static final double tipRate = .075;
 
    private String roomNum;
    private int guestNum;
    private int nightNum;
    private double AmDue;
    private double ml;
    private double tx;
    private double subTot;
    private double tot;
    private double tip;
 
    public double TotAmD;
 
    public customer(String rmN)
    {    roomNum = rmN;
         guestNum = 1;
         nightNum = 1;
    }
 
    public customer(String rmN, int night)
    {    this(rmN);
         nightNum = night;
    }
 
    public customer(String rmN, int night, int guest)
    {    this(rmN, night);
         guestNum = guest;
    }
 
    public void add(int night)
    {    nightNum = nightNum + night;
    }
 
    public void calculate()
    {    AmDue = RmR*nightNum*guestNum;
         tx = AmDue*TxR/100;
         subTot = AmDue+tx;
         ml = mlC*(nightNum*guestNum);
         tip = tipRate*(subTot+ml+PhC);
         tot = subTot+PhC+ml+tip;
 
    }
 
    public void TotAmD()
    {    TotAmD = +AmDue;
    }
 
    public double getAmDue()
    {    return AmDue;
    }
 
    public double getTxD()
    {    return tx;
    }
 
    public double getTxR()
    {    return TxR;
    }
 
    public double getsubTot()
    {    return subTot;
    }
 
    public double gettot()
    {    return tot;
    }
 
    public double gettip()
    {    return tip;
    }
 
    public double getMl()
    {    return ml;
    }
 
    public double getRmR()
    {    return RmR;
    }
 
    public double getPhC()
    {    return PhC;
    }
 
    public String getTheRmN()
    {    return roomNum;
    }
 
    public int getNn()
    {    return nightNum;
    }
 
    public int getGn()
    {    return guestNum;
    }
 
    public double getTotAmD()
    {    return TotAmD;
    }
 
 }
 
and 2.) class myHotel
 
package Hotel;
 
import java.util.Date;
import java.text.DateFormat;
import java.text.NumberFormat;
import java.util.Locale;
 
public class myHotel
{   
 
    public static void main(String[] args)
    {   NumberFormat nf = NumberFormat.getCurrencyInstance(Locale.US);
 
 
     // Create customer objects, calculate amounts, display receipts
        customer c1 = new customer("12 - B");
        c1.calculate();
        displayReceipt(c1, nf);
 
        customer c2 = new customer("12 - C", 2);
        c2.calculate();
        displayReceipt(c2, nf);
 
        customer c3 = new customer("12 - D", 2, 2);
        c3.calculate();
        displayReceipt(c3, nf);
 
     // Call method to print summary information
        summary(nf);
 
    }
  static void displayReceipt(customer h, NumberFormat f)
      {
    // Set up and display heading and date for each receipt
        System.out.println("\tThe ABC Cheap Lodging, Inc");
        Date d = new Date();
        DateFormat df = DateFormat.getDateInstance();
        System.out.println("\tDate: \t" + df.format(d));
 
   // Disply expenses line by line including subtotal
        System.out.println("Room# \t\t" + h.getTheRmN());
        System.out.println("Room Rate: \t" + f.format(h.getRmR()));
        System.out.println("Length of stay\t" + h.getNn() + " nights");
        System.out.println("No. of guests: \t" + h.getGn());
        System.out.println("Room cost: \t" + f.format(h.getAmDue()));
        System.out.println("Tax : " + h.getTxR() + "%\t"  + f.format(h.getTxD()));
        System.out.println("\tSubtotal \t" + f.format(h.getsubTot()));
        System.out.println("Telephone \t" + f.format(h.getPhC()));
        System.out.println("Meal charges \t" + f.format(h.getMl()));
        System.out.println("Tip \t\t" + f.format(h.gettip()));
  //Display to total
        System.out.println("\nTOTAL AMOUNT DUE\t" + f.format(h.gettot()));
 
  // Display thank you message
        System.out.println("\nThanks for staying at The ABC Cheap Lodging, Inc" );
        System.out.println("\tPlease come again !!!");
        System.out.println("\n");
      }
 
 static void summary(NumberFormat nf)
  {
          System.out.println("\n\n\tOfficial Use Only\n\n\tToday's Summary");
          System.out.println("\tROOM ......" +customer.getTotAmD());
          System.out.println("\tPHONE ....." + nf.format(customer.getTotPhC()));
          System.out.println("\tPHONE ....." + nf.format(customer.getTotmlC()));
          System.out.println("\tTIP ......." + nf.format(customer.getTottip()));
          System.out.println("\tTAX ......." +nf.format(customer.getTottax()));  
 
// Complete this method that prints the summary
      System.out.println("\t__________________");
  }
}

 
double total = 0;
for( int i = 0; i < customers.length(); i++ )
    total = customers[i].getAmount();
    // I'm not sure what field you want to put together, just looked at your code briefly, but
   // this (I think) is what you're looking for

total += customers[i].getAmount();