間違えたんで細部修正
var TextModel = function()
{
　　this = new java.beans.PropertyChangeSupport( this );
　　var text = "";

　　this.getText = function(){ retrun text; }
　　this.setText = function( value )
　　{
　　　　var old = text;
　　　　text = value;
　　　　this.firePropertyChange( "text", old, text );
　　}
}

var modelDependencyAdapter = function( textView, model, key ) // keyはSmalltalkならSymbol、C++ならtemplateで対応する
{
　var dependency = {};
　dependency.propertyChange = function( event ) { textView.setText( model[key]() ); };
　return dependency;
}

var model = new TextModel();
text = new JTextField();
model.addPropertyChangeListener( "text", modelDependencyAdapter( text, model, "getText" ) );
label = new JLabel();
model.addPropertyChangeListener( "text", modelDependencyAdapter( label, model, "getText" ) );
JButton button = new JButton();
button.addActionListener( function() { model.setText( "hello"); } );