Using an InputVerifier with a formatted textfield

   
/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
*/
// FtfInputVerifier.java
//An example of using an InputVerifier with a formatted textfield.
//

import javax.swing.BorderFactory;
import javax.swing.InputVerifier;
import javax.swing.JComponent;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class FtfInputVerifier {

  public static void main(String argv[]) {

    java.net.URL u = null;
    try {
      u = new java.net.URL("http://www.ora.com/");
    } catch (java.net.MalformedURLException ignored) {
    }

    // create two identical JFormattedTextFields
    JFormattedTextField ftf1 = new JFormattedTextField(u);
    JFormattedTextField ftf2 = new JFormattedTextField(u);

    // and set an InputVerifier on one of them
    ftf2.setInputVerifier(new InputVerifier() {
      public boolean verify(JComponent input) {
        if (!(input instanceof JFormattedTextField))
          return true; // give up focus
        return ((JFormattedTextField) input).isEditValid();
      }
    });

    JPanel p = new JPanel(new java.awt.GridLayout(0, 2, 3, 8));
    p.add(new JLabel("plain JFormattedTextField:", JLabel.RIGHT));
    p.add(ftf1);
    p.add(new JLabel("FTF with InputVerifier:", JLabel.RIGHT));
    p.add(ftf2);
    p.add(new JLabel("plain JTextField:", JLabel.RIGHT));
    p.add(new JTextField(u.toString()));
    p.setBorder(BorderFactory.createEmptyBorder(8, 8, 8, 8));

    JFrame f = new JFrame("FtfInputVerifier");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.getContentPane().add(
        new JLabel("Try to delete the colon in each field.",
            JLabel.CENTER), java.awt.BorderLayout.NORTH);
    f.getContentPane().add(p, java.awt.BorderLayout.CENTER);
    f.pack();
    f.setVisible(true);
  }
}

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Using an InputVerifier with a formatted textfield : Formatted TextField « Swing JFC « Java

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