Using showInputDialog to accept integer only

[Lamirp]

Ok I'm just looking for a cleaner way to achieve my goal here, if there is one and if this is not much of a satisfactory method. The goal is to accept an integer from a user using JOptionPane.showInputDialog.

A brief example of what I'm currently doing

        do
        {
            check = true;
        try
        {
            num = Integer.parseInt(JOptionPane.showInputDialog("How many items do you need to list?"));
        }
        catch(NumberFormatException nfe)
        {
            nfe.printStackTrace();
            check = false;
        }
    }while(!check);

Just curious for better methods, faster, cleaner etc. Thanks in advance

[mKorbel]

use JFormattedTextField

[JamesCherrill]

mKorbel: Hi. What's the easiest way you know to use a JFormattedTextField for the input in a JOptionPane InputDialog?

[mKorbel]

@JamesCherrill great minds thinks alike ---> I see that good point, there is only String for showInputDialog

[JamesCherrill]

OK. I hoped you found a new idea there. :(

So the best answer we have is "you can't change the text field in a JOptionPane.showInputDialog, so you will have to create a custom dialog and use a JFornattedTextField". For examples just Google "custom JDialog"

[Lamirp]

Yep, thank you guys for the help. I am in a beginners data structures class that is requiring we use JOptionPane. I've been coding Java for a couple years, so I was just trying to see if I could improve upon anything that seemed like it could be cut down.

[mKorbel]

@JamesCherrill

• this is valid for JOptionPane.showInputDialog, rest ise customizable

• you can to add any JComponent to JOptionPane.showInputDialog but return value is from built_in JTextField

• is possible to derive, to the pieces, but then is better to use custom showMessageDialog

• but see one of ways, without hacks :-),

.

import java.awt.EventQueue;
import javax.swing.Icon;
import javax.swing.JOptionPane;
import javax.swing.UIManager;

public class MyOptionPane {

    public MyOptionPane() {
        Icon errorIcon = UIManager.getIcon("OptionPane.errorIcon");
        Object[] possibilities = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13};
        Integer i = (Integer) JOptionPane.showInputDialog(null,
                "Select number:\n\from JComboBox", "ShowInputDialog",
                JOptionPane.PLAIN_MESSAGE, errorIcon, possibilities, "Numbers");
        if ((i != null) && (i > 0)) {
            System.out.println((i));
        }
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                MyOptionPane mOP = new MyOptionPane();
            }
        });
    }
}