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.