new MaskFormatter("LLLL") : MaskFormatter « javax.swing.text « Java by API

1. Java by API
2. javax.swing.text
3. MaskFormatter

new MaskFormatter("LLLL")

import java.awt.BorderLayout;
import java.text.ParseException;

import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.TitledBorder;
import javax.swing.text.DefaultFormatterFactory;
import javax.swing.text.MaskFormatter;

public class MainClass {

  public static JPanel demo1() {
    JPanel pan = new JPanel(new BorderLayout());
    pan.setBorder(new TitledBorder("Demo 1: format toggles with focus"));

    MaskFormatter withFocus = null, withoutFocus = null;
    try {
      withFocus = new MaskFormatter("LLLL");
      withoutFocus = new MaskFormatter("UUUU");
    } catch (ParseException pe) {
    }

    DefaultFormatterFactory factory = new DefaultFormatterFactory(withoutFocus, null, withFocus);

    JFormattedTextField field = new JFormattedTextField(factory);
    field.setValue("Four");
    pan.add(field, BorderLayout.CENTER);

    return pan;
  }

  public static void main(String argv[]) {
    JFrame f = new JFrame("FactoryDemo");
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.getContentPane().add(demo1(), BorderLayout.NORTH);
    f.getContentPane().add(new JTextField(), BorderLayout.SOUTH);
    f.setSize(240, 160);
    f.setVisible(true);
  }
}

           
       

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