| AbstractPreferences | 
This class provides a skeletal implementation of the  Preferences
 class, greatly easing the task of implementing it.  
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| BackingStoreException | 
 Thrown to indicate that a preferences operation could not complete because
 of a failure in the backing store, or a failure to contact the backing
 store. 
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| InvalidPreferencesFormatException | 
Thrown to indicate that an operation could not complete because
 the input did not conform to the appropriate XML document type
 for a collection of preferences, as per the  Preferences
 specification.  
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| NodeChangeEvent | 
 An event emitted by a Preferences node to indicate that
 a child of that node has been added or removed. 
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| NodeChangeListener | 
 A listener for receiving preference node change events. 
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| PreferenceChangeEvent | 
 An event emitted by a Preferences node to indicate that
 a preference has been added, removed or has had its value changed. 
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| PreferenceChangeListener | 
 A listener for receiving preference change events. 
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| Preferences | 
 A node in a hierarchical collection of preference data. 
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