Uses of Class java.util.prefs.Preferences (Java SE 9 & JDK 9 )

## 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.