Question

In Java JOptionPane how do you validate if a user enters an integer value? How do you reprompt the user to enter an integer if they first entered a double or a string value?

int length = Integer.parseInt(JOptionPane.showInputDialog("Enter the length: "));

int width = Integer.parseInt(JOptionPane.showInputDialog("Enter the width: "));

int height = Integer.parseInt(JOptionPane.showInputDialog("Enter the height: "));

Answer 1

import javax.swing.*;

public class ValidateIntegerInput {

    public static void main(String[] args) {
        int length, width, height;
        while (true) {
            try {
                length = Integer.parseInt(JOptionPane.showInputDialog("Enter the length: "));
                break;
            } catch (Exception e) {

            }
        }
        while (true) {
            try {
                width = Integer.parseInt(JOptionPane.showInputDialog("Enter the width: "));
                break;
            } catch (Exception e) {

            }
        }
        while (true) {
            try {
                height = Integer.parseInt(JOptionPane.showInputDialog("Enter the height: "));
                break;
            } catch (Exception e) {

            }
        }
        JOptionPane.showMessageDialog(null, "Length: " + length + ", Width: " + width + ", Height: " + height);
    }
}