# Uses of Class
java.util.prefs.Preferences

Packages that use Preferences
Package
Description
java.util.prefs
This package allows applications to store and retrieve user and system preference and configuration data.
jdk.jshell.tool
Provides a mechanism to launch an instance of a Java shell tool.

- ## Uses of Preferences in java.util.prefs

  Subclasses of Preferences in java.util.prefs
  Modifier and Type
  Class
  Description
  `class`
  `AbstractPreferences`
  This class provides a skeletal implementation of the `Preferences` class, greatly easing the task of implementing it.
  Methods in java.util.prefs that return Preferences
  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.
  `static Preferences`
  Preferences.`systemRoot()`
  Returns the root preference node for the system.
  `Preferences`
  PreferencesFactory.`systemRoot()`
  Returns the system root preference node.
  `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.
  `static Preferences`
  Preferences.`userRoot()`
  Returns the root preference node for the calling user.
  `Preferences`
  PreferencesFactory.`userRoot()`
  Returns the user root preference node corresponding to the calling user.
  Constructors in java.util.prefs with parameters of type Preferences
  Modifier
  Constructor
  Description
  ``
  `NodeChangeEvent(Preferences parent, Preferences child)`
  Constructs a new `NodeChangeEvent` instance.
  ``
  `PreferenceChangeEvent(Preferences node, String key, String newValue)`
  Constructs a new `PreferenceChangeEvent` instance.

- ## Uses of Preferences in jdk.jshell.tool

  Methods in jdk.jshell.tool with parameters of type Preferences
  Modifier and Type
  Method
  Description
  `JavaShellToolBuilder`
  JavaShellToolBuilder.`persistence(Preferences prefs)`
  Set the storage mechanism for persistent information which includes input history and retained settings.