| Package | Description | 
|---|---|
| java.util.prefs | This package allows applications to store and retrieve user and system
preference and configuration data. | 
| Modifier and Type | Class | Description | 
|---|---|---|
| class  | AbstractPreferencesThis class provides a skeletal implementation of the  Preferencesclass, greatly easing the task of implementing it. | 
| Modifier and Type | Method | Description | 
|---|---|---|
| Preferences | NodeChangeEvent. getChild()Returns the node that was added or removed. | |
| Preferences | PreferenceChangeEvent. getNode()Returns the preference node that emitted the event. | |
| Preferences | NodeChangeEvent. getParent()Returns the parent of the node that was added or removed. | |
| Preferences | AbstractPreferences. node(String path)Implements the node method as per the specification in
  node(String). | |
| abstract Preferences | Preferences. node(String pathName)Returns the named preference node in the same tree as this node,
 creating it and any of its ancestors if they do not already exist. | |
| Preferences | AbstractPreferences. parent()Implements the parent method as per the specification in
  parent(). | |
| abstract Preferences | Preferences. parent()Returns the parent of this preference node, or null if this is
 the root. | |
| static Preferences | Preferences. systemNodeForPackage(Class<?> c)Returns the preference node from the system preference tree that is
 associated (by convention) with the specified class's package. | |
| Preferences | PreferencesFactory. systemRoot()Returns the system root preference node. | |
| static Preferences | Preferences. systemRoot()Returns the root preference node for the system. | |
| static Preferences | Preferences. userNodeForPackage(Class<?> c)Returns the preference node from the calling user's preference tree
 that is associated (by convention) with the specified class's package. | |
| Preferences | PreferencesFactory. userRoot()Returns the user root preference node corresponding to the calling
 user. | |
| static Preferences | Preferences. userRoot()Returns the root preference node for the calling user. | 
| Constructor | Description | 
|---|---|
| NodeChangeEvent(Preferences parent,
               Preferences child)Constructs a new  NodeChangeEventinstance. | |
| PreferenceChangeEvent(Preferences node,
                     String key,
                     String newValue)Constructs a new  PreferenceChangeEventinstance. | 
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