# 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
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.