tutego

This little example will show you how to bind a JTextField to a name property of a Person with Beans Binding (JSR-295). First the Person:

package com.tutego.binding;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;

public class Person
{
 private PropertyChangeSupport pcs = new PropertyChangeSupport( this );

 private String name = "";

 public void addPropertyChangeListener( PropertyChangeListener x )
 {
   pcs.addPropertyChangeListener( x );
 }

 public void removePropertyChangeListener( PropertyChangeListener x )
 {
   pcs.removePropertyChangeListener( x );
 }

 public String getName()
 {
   return name;
 }

 public void setName( String name )
 {
   String old = getName();
   this.name = name;
   pcs.firePropertyChange( "name", old, getName() );
  
   System.out.println( "Changed name!" );
 }
}

The code for the JavaBean Person is a litte bit cumbersome because of the PropertyChangeListener who will notify the Binding Framework if the model change.

package com.tutego.binding;

import javax.beans.binding.BindingContext;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class BindingDemo
{
 public static void main( String[] args )
 {
   Person p = new Person();

   JTextField tf = new JTextField();

    BindingContext bindingContext = new BindingContext();
   bindingContext.addBinding( p, "${name}", tf, "text" );
   bindingContext.bind();
  
   JFrame f = new JFrame();
   f.add( tf );
   f.pack();
   f.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   f.setVisible( true );

   p.setName( "Christian Ullenboom" );
 }
}

Swing on the other side will although notify the model if the user type text in the text field and press Return. This will change the model.