Code example for PropertyChangeListener

Methods: propertyChange

        if (listener == null)
        } else 
     * This method should be overridden if self-removal logic should take place. 
     * It will be called when it's found that the wrapped listener is no longer 
     * existing and this wrapper can be safely removed from the source of events. 
     * @param source source of events. 
    protected abstract void removeThisListener(Object source); 
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