Accessing ArrayList object

Question

Hi all - this code is full of errors, but here's my main question...
I have this code in the beginning of the getTotalSales() method (in the Station class): total += (myPumps.get(0).getGallonsSold()) * (myBasePrice +.25); Apparently, that's not working - it causes a compiler error "cannot find symbol - method getGallonsSold()". I'm not sure how else to do it, since I'm using an ArrayList. Any suggestions?
Thanks, I really appreciate the help. My full code is below...
import java.io.*;
import java.util.*;
import chn.util.*;
class Pump
       private double gallonsSold;
       public Pump( )
          gallonsSold = 0;
       public double getGallonsSold()
          return gallonsSold;
       public void resetGallonsSold()
          gallonsSold = 0;
class Station
       private double myBasePrice;
       private ArrayList myPumps;   //contains an arraylist of object pumps
       public Station()
          myBasePrice = 2.00;
          myPumps = new ArrayList<Pump>();
       public double getTotalSales()
          double total = 0.00;
          total += (myPumps.get(0).getGallonsSold()) * (myBasePrice +.25);
          total += (myPumps.get(1).getGallonsSold()) * (myBasePrice +.25);
          if (myPumps.size() > 2)
              for(int x=2; x<myPumps.size(); x++)
                  total += (myPumps.get(x).getGallonsSold()) * (myBasePrice);
       public void resetAll( )
          for(Pump p: myPumps)
              p.resetGallonsSold();
       public void closeStation(FileOutput outFile)
          outFile.println("Total day's sales: $" + getTotalSales());
public class week29
    public static void main(String[] args)
        Scanner in = new Scanner(System.in);
        Station s = new Station();
        System.out.print("create a station with how many pumps? (the first two will be full service) -->");
        int numPumps = in.nextInt();
        for (int i=0; i <= numPumps; i++)
            s.myPumps.add(new Pump());
        System.out.println("Station created with a base price of $2/gallon and full service price of $2.25/gallon");
        boolean quit = false;
        while (!quit)
            System.out.println("-- Menu --");
            System.out.println("0 - buy gas");
            System.out.println("1 - get total sales");
            System.out.println("2 - reset all sales");
            System.out.println("3 - close station, write total sales to file, and exit");
            System.out.print("enter choice --> ");
            int choice = in.nextInt();
            if (choice == 0)
                System.out.printf("Available pumps: 0 - %d (0 and 1 are full service)\n", numPumps-1);
                System.out.print("Buy from which pump? --> ");
                int p = in.nextInt();
                System.out.print("Buy how many gallons? --> ");
                double g = in.nextDouble();
                s.myPumps.get(p).gallonsSold += g;
            else if (choice == 1)
                System.out.println("Total sales: "+ s.getTotalSales());
            else if (choice == 2)
                System.out.println("Sales reset.");
                s.resetAll();
            else if (choice == 3)
                FileOutput outFile = new FileOutput("station.txt");
                System.out.println("Writing total sales to station.txt and exiting.");
                s.closeStation(outFile);
                quit = true;
}

Answer 1

You have a lot of other things that won't work. You can't access "s.myPumps" because myPumps is private. You need a "getPumps()" (returning a List<Pump>) or a "getPump(int pumpNumber)" (returning a Pump)---probably the latter is better. You need to have a "addGallonsSold(double gal)" method in Pump--you can't manipulate gallonsSold directly from your test driver.
You should not have the following in main:
for (int i=0; i <= numPumps; i++)
            s.myPumps.add(new Pump());
        } You should make a constructor for Station that takes the number of pumps, and put the 'for' loop there.
Your Station will blow up if the user doesn't specify at least 2 pumps.