java.util.prefs (Java SE 26 & JDK 26)
Description: declaration: module: java.prefs, package: java.util.prefs
Keywords: java.util.prefs package

# Package java.util.prefs

package java.util.prefs
This package allows applications to store and retrieve user and system preference and configuration data. This data is stored persistently in an implementation-dependent backing store. There are two separate trees of preference nodes, one for user preferences and one for system preferences.

Since:
  1.4

- Related Packages
  Module
  Package
  Description
  java.base
  java.util
  Contains the collections framework, some internationalization support classes, a service loader, properties, random number generation, string parsing and scanning classes, base64 encoding and decoding, a bit array, and several miscellaneous utility classes.
- Class
  Description
  AbstractPreferences
  This class provides a skeletal implementation of the `Preferences` class, greatly easing the task of implementing it.
  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.
  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.
  NodeChangeEvent
  An event emitted by a `Preferences` node to indicate that a child of that node has been added or removed.
  NodeChangeListener
  A listener for receiving preference node change events.
  PreferenceChangeEvent
  An event emitted by a `Preferences` node to indicate that a preference has been added, removed or has had its value changed.
  PreferenceChangeListener
  A listener for receiving preference change events.
  Preferences
  A node in a hierarchical collection of preference data.
  PreferencesFactory
  A factory object that generates Preferences objects.