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The class with the bound property creates an instance of the PropertyChangeSupport class: PropertyChangeSupport pcs = new PropertyChangeSupport(this); and uses its add and remove listener methods.
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Then the class with the bound property must call firePropertyChange whenever it changes the value of the bound property (i.e. in the set method of the property).
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| 3 |
Any class which wants to be notified of changes to the bound property must implement the PropertyChangeListener and supply a method propertyChange that will be called with a PropertyChangeEvent. This method can event methods getOldValue() and getNewValue.
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