Toolkit.java 文件源码

@Override
public synchronized PropertyChangeListener[] getPropertyChangeListeners()
{
    PropertyChangeSupport pcs = (PropertyChangeSupport)
            AppContext.getAppContext().get(PROP_CHANGE_SUPPORT_KEY);
    if (null != pcs) {
        return pcs.getPropertyChangeListeners();
    } else {
        return new PropertyChangeListener[0];
    }
}