/*
 * WasherApp.java    Authors: Koffman & Wolz
 * A class that finds the weight of a batch of flat washers
 */
import javax.swing.JOptionPane;

public class WasherApp {

  // postcondition: returns a type double data value
  private static double readDouble(String prompt) {
    String numStr = JOptionPane.showInputDialog(prompt);
    return Double.parseDouble(numStr);
  }

  // postcondition: returns a type int data value
  private static int readInt(String prompt) {
    String numStr = JOptionPane.showInputDialog(prompt);
    return Integer.parseInt(numStr);
  }

  public static void main(String[] args) {
     // Create a Washer object
     Washer wash = new Washer();

     // Get the washer data and store it in the Washer object.
     wash.setInner(readDouble("Enter inner diameter in centimeters") / 2);
     wash.setOuter(readDouble("Enter outer diameter in centimeters") / 2);
     wash.setThickness(readDouble("Enter thickness in centimeters"));
     wash.setDensity(readDouble("Enter density in grams per cc"));

     // Get the quantity of washers.
     int quantity = readInt("Enter quantity");

     // Calculate the batch weight.
     double batchWeight = quantity * wash.computeWeight();

     // Display the washer information and the batch weight.
     JOptionPane.showMessageDialog(null, wash.toString() +
                                   "\nThe weight of " + quantity +
                                   " washers is " + batchWeight + " grams");
  }
}