Currency issue issue in Java

Question

I try to teach myself Java and run into two little hiccups in only two chapters in the book I received: P This is one of one of the exercises:

"Write a class that calculates and displays the conversion of the entered number of dollars into banknotes --- 20 s, 10 s, 5 s and 1 s."

I’m going to read from 0 knowledge of coding for four hours so far, so hopefully this doesn’t seem like a simple question to answer. I'm sure there is a much more efficient way to write all of this, but my question is how can I finish everything if the user answers “yes” or continues to work with the revised version if they answer “no”?

Also, any advice or recommendations that you guys can give me while studying Java will be very grateful! Thanks for taking the time to read this.

import javax.swing.JOptionPane; public class Dollars { public static void main(String[] args) { String totalDollarsString; int totalDollars; totalDollarsString = JOptionPane.showInputDialog(null, "Enter amount to be converted", "Denomination Conversion", JOptionPane.INFORMATION_MESSAGE); totalDollars = Integer.parseInt(totalDollarsString); int twenties = totalDollars / 20; int remainderTwenty = (totalDollars % 20); int tens = remainderTwenty / 10; int remainderTen = (totalDollars % 10); int fives = remainderTen / 5; int remainderFive = (totalDollars % 5); int ones = remainderFive / 1; JOptionPane.showMessageDialog(null, "Total Entered is $" + totalDollarsString + "\n" + "\nTwenty Dollar Bills: " + twenties + "\nTen Dollar Bills: " + tens + "\nFive Dollar Bills: " + fives + "\nOne Dollar Bills: " + ones); int selection; boolean isYes, isNo; selection = JOptionPane.showConfirmDialog(null, "Is this how you wanted the total broken down?", "Select an Option", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE); isYes = (selection == JOptionPane.YES_OPTION); JOptionPane.showMessageDialog(null, "You responded " + isYes + "\nThanks for your response!"); isNo = (selection == JOptionPane.NO_OPTION); int twenties2 = totalDollars / 20; int tens2 = totalDollars / 10; int fives2 = totalDollars / 5; int ones2 = totalDollars / 1; JOptionPane.showMessageDialog(null, "Total Entered is $" + totalDollarsString + "\n" + "\nTwenty Dollar Bills: " + twenties2 + "\nTen Dollar Bills: " + tens2 + "\nFive Dollar Bills: " + fives2 + "\nOne Dollar Bills: " + ones2); } } 

Answer 1

First, you really don't need two booleans for isYes and isNo. Basically, you ask the user if he wants a different solution, that is, one true / false value (or rather: isNo is the same as! IsYes, since the parameter bar returns only one of the values ​​YES_OPTION and NO_OPTION).

What you want to do next is switch to your “refined” version if the user indicates that the first result was not what he wanted:

 int selection = JOptionPane.showConfirmDialog(null, "Is this how you wanted the total broken down?", "Select an Option", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE); if (selection == JOptionPane.NO_OPTION) { int twenties2 = totalDollars / 20; int tens2 = totalDollars / 10; int fives2 = totalDollars / 5; int ones2 = totalDollars / 1; JOptionPane.showMessageDialog(null, "Total Entered is $" + totalDollarsString + "\n" + "\nTwenty Dollar Bills: " + twenties2 + "\nTen Dollar Bills: " + tens2 + "\nFive Dollar Bills: " + fives2 + "\nOne Dollar Bills: " + ones2); } 

If the user selects "Yes", your main method is executed in any case, so in this case you do not need to do anything.