监听器

        this.addPropertyChangeListener("items", new PropertyChangeListener(){
            public void propertyChange(PropertyChangeEvent evt) {
                firePropertyChange("value", null, value);
            }
        });

 

第一个属性"items"是this的属性.

public class PropertyChangeSupport implements java.io.Serializable { 
    public void firePropertyChange(String propertyName,
                    Object oldValue, Object newValue) {
    if (oldValue != null && newValue != null && oldValue.equals(newValue)) {
        return;
    }
    firePropertyChange(new PropertyChangeEvent(source, propertyName,
                           oldValue, newValue));
    }
}

 

 

public void firePropertyChange(PropertyChangeEvent evt) {
    Object oldValue = evt.getOldValue();
    Object newValue = evt.getNewValue();
        String propertyName = evt.getPropertyName();
    if (oldValue != null && newValue != null && oldValue.equals(newValue)) {
        return;
    }

    if (listeners != null) {
        Object[] list = listeners.getListenersInternal();
        for (int i = 0; i < list.length; i++) {
        PropertyChangeListener target = (PropertyChangeListener)list[i];
        target.propertyChange(evt);
        }
    }

    if (children != null && propertyName != null) {
        PropertyChangeSupport child = null;
        child = (PropertyChangeSupport)children.get(propertyName);
        if (child != null) {
        child.firePropertyChange(evt);
        }
    }
}