This is a java programing problem. I need help with the exception handling on th

Question

This is a java programing problem. I need help with the exception handling on the cancel button. The way my code is now, if the user selects cancel, the program blows up. Im not sure how to do the exption handling for the cancel button.

import java.text.DecimalFormat;

import javax.swing.JOptionPane;

public class CurrencySwing {

   public static void main(String[] args) {

       // declare and construct variables

       double dollarAmount, euros, pounds, rubles;

       DecimalFormat twoDigits = new DecimalFormat("####.00");

       //print prompts and get input

           dollarAmount = Double.parseDouble(JOptionPane.showInputDialog(null, "Enter your dollar amount:"));

       // calculations

       euros = dollarAmount*0.91;

       pounds = dollarAmount*0.64;

       rubles = dollarAmount * 61.73;

       // output

       JOptionPane.showMessageDialog( null, "YOUR DOLLAR AMOUNT OF " + twoDigits.format(dollarAmount) +" is equal to "+ twoDigits.format(euros)+" euros, "+twoDigits.format(pounds)+ " pounds and "+twoDigits.format(rubles)+ " rubles.",null, JOptionPane.PLAIN_MESSAGE);

   System.exit(0);

   }

}

Explanation / Answer

HI

I have modified the code and highlighted the code changes below

CurrencySwing.java

import java.text.DecimalFormat;

import javax.swing.JOptionPane;

public class CurrencySwing {

public static void main(String[] args) {

// declare and construct variables

double dollarAmount, euros, pounds, rubles;

DecimalFormat twoDigits = new DecimalFormat("####.00");

//print prompts and get input

boolean flag = false;

while(!flag) {

try {

dollarAmount = Double.parseDouble(JOptionPane.showInputDialog(null, "Enter your dollar amount:"));

// calculations

euros = dollarAmount*0.91;

pounds = dollarAmount*0.64;

rubles = dollarAmount * 61.73;

// output

JOptionPane.showMessageDialog( null, "YOUR DOLLAR AMOUNT OF " + twoDigits.format(dollarAmount) +" is equal to "+ twoDigits.format(euros)+" euros, "+twoDigits.format(pounds)+ " pounds and "+twoDigits.format(rubles)+ " rubles.",null, JOptionPane.PLAIN_MESSAGE);

flag = true;

} catch(Exception e) {

JOptionPane.showMessageDialog(null,"Invalid Input. Please try again");

}

}

}

}

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