input errors in JDialogs

[Barry Brashear]

What is the best idea for presenting input errors to the user in a JDialog?
Should you have a JLable at the bottom where you place an error message?

Thanks.

[Serghei Jelauc]

May be a did not understand the question, but why not? Of corse you can add JLabel to the JDialog. Try this:

  
package jdialog;
 
import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JDialog;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JPanel;
 
public class Test extends JFrame{
    
    JButton b = new JButton("Open Dialod");
    
    public Test() {
        this.getContentPane().add(b, "South");
        b.addActionListener(listener);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setSize(650, 500);
        this.setLocation(200, 200);
        this.setVisible(true);
    }
    
    ActionListener listener = new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            MyDialog dialog = new MyDialog(Test.this);
        }
    };
    
    public static void main(String[] args) {
        new Test();
    }
}
 
class MyDialog extends JDialog {
    JTextField text = new JTextField(25);
    JPanel textPanel = new JPanel();
    JButton b = new JButton("Enter");
    JLabel label = new JLabel();
    public MyDialog(JFrame frame) {
        super(frame, "My Dialog", true);
        textPanel.add(text);
        textPanel.add(b);
        this.getContentPane().add(textPanel, "North");
        b.addActionListener(listener);
        this.getContentPane().add(label, "South");
        this.setSize(450, 150);
        this.setLocation(250, 250);
        setVisible(true);
    }
    
    ActionListener listener = new ActionListener() {
      public void actionPerformed(ActionEvent e) {
          if (text.getText().length() > 10){
              label.setText("User Input ERROR");
          }
          else
             MyDialog.this.dispose(); 
      }
    };
}

Hope it will help