Thread: How can I make a loop repeat?

 
import javax.swing.JOptionPane;
public class program7 {
 
    public static void main(String[] args) {
 
//ask user how many euros a dollar buys
String euroExchangeRateString = JOptionPane.showInputDialog
        (null, "Enter how many Euros one Dollar will buy");
double euroExchangeRate = Double.parseDouble(euroExchangeRateString);
 
//ask user how many pounds a dollar will buy
String poundExchangeRateString = JOptionPane.showInputDialog
        (null, "Enter how many Pounds one Dollar will buy");
double poundExchangeRate =  Double.parseDouble(poundExchangeRateString);
 
//ask user how many yen a dollar will buy
String yenExchangeRateString = JOptionPane.showInputDialog
        (null, "Enter how many Yen one Dollar will buy");
double yenExchangeRate = Double.parseDouble(yenExchangeRateString);
 
//ask user to enter the number of dollars they have
 
    String amountDollarsString = JOptionPane.showInputDialog
(null, "Enter the amount of foreign currency you want to buy in U.S. dollars");
double amountDollars = Double.parseDouble(amountDollarsString);
if (amountDollars <= 100){
amountDollars -= amountDollars * 0.10;
JOptionPane.showMessageDialog
        (null,"You can buy $" + amountDollars + " in foreign currency.");
}
else if (amountDollars > 100) {
amountDollars -= amountDollars * 0.05;
JOptionPane.showMessageDialog
        (null,"You can buy $" + amountDollars + " in foreign currency.");
    }
 
 
String reply = JOptionPane.showInputDialog 
    (null, "Enter 'E' to buy Euros, 'P' to buy Punds or 'Y' to buy Yen");
char firstChar = reply.charAt(0);
 
while (firstChar == 'E' || firstChar == 'e'){
double amountEuros = (amountDollars * euroExchangeRate);
JOptionPane.showMessageDialog
        (null, "You have purchased " + amountEuros + " Euros.");
}
if (firstChar == 'P' || firstChar == 'p') {
double amountPounds = (amountDollars * poundExchangeRate);
JOptionPane.showMessageDialog
        (null, "You have purchased " + amountPounds + " Pounds.");
}
else if (firstChar == 'Y' || firstChar == 'y') {
double amountYen = (amountDollars * yenExchangeRate);
JOptionPane.showMessageDialog
        (null, "You have purchased " + amountYen + " Yen.");
}
JOptionPane.showConfirmDialog
        (null, "Are there any more conversions you would like to perform?");
        }
    }

On the last part, the program is supposed to ask the user if there are anymore conversions to perform. I put in a confirm dialog box, but when the user clicks yes it does not go back to repeat the previous loop. How can I make it do that?

One way to make things repeat is to ask the same question several times, but we ask that you not do this. Closed as duplicate.