# Package java.util.prefs

This package allows applications to store and retrieve user and system preference and configuration data.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  NodeChangeListener | A listener for receiving preference node change events.
  PreferenceChangeListener | A listener for receiving preference change events.
  PreferencesFactory | A factory object that generates Preferences objects.

- Class Summary
  Class | Description
  --- | ---
  AbstractPreferences | This class provides a skeletal implementation of the `Preferences` class, greatly easing the task of implementing it.
  NodeChangeEvent | An event emitted by a `Preferences` node to indicate that a child of that node has been added or removed.
  PreferenceChangeEvent | An event emitted by a `Preferences` node to indicate that a preference has been added, removed or has had its value changed.
  Preferences | A node in a hierarchical collection of preference data.

- Exception Summary
  Exception | Description
  --- | ---
  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.

## Package java.util.prefs Description

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:
  JDK1.4

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