CIS 260 IOapalooza3.java

Code

/*
    IOapalooza3.java
    CIS 260
    David Klick
    2006-01-18

    This program demonstrates simple GUI I/O using
    JOptionPanes. It also demonstrates a simple
    input loop and basic data validation.
*/

import javax.swing.*;

public class IOapalooza3 {
    public static void main(String[] args) {
        int sum = 0;
        String strIn = JOptionPane.showInputDialog("Enter an integer (QUIT to exit)");
        while (!strIn.equalsIgnoreCase("QUIT")) {
            try {
                int num = Integer.parseInt(strIn);
                sum += num;
            } catch (NumberFormatException e) {
                JOptionPane.showMessageDialog(null, "Illegal integer",
                    "Error", JOptionPane.ERROR_MESSAGE);
            }
            strIn = JOptionPane.showInputDialog("Enter an integer (QUIT to exit)");
        }
        JOptionPane.showMessageDialog(null, "The total is " + sum,
            "Total", JOptionPane.INFORMATION_MESSAGE);
        System.exit(0);
    }
}