AbstractPreferences

AbstractPreferences

java.util.prefs

---

Java 1.4

This class implements all the abstract methods of Preferences on top of a smaller set of abstract methods. Programmers creating a Preferences implementation (or "service provider") can subclass this class and need define only the nine methods whose names end in "Spi". Application programmers never need to use this class.

Figure 16-124. java.util.prefs.AbstractPreferences

 public abstract class  AbstractPreferences  extends Preferences {  // Protected Constructors  protected  AbstractPreferences  (AbstractPreferences  parent  , String  name  );  // Event Registration Methods (by event name)  public void  addNodeChangeListener  (NodeChangeListener  ncl  );                 Overrides:Preferences      public void  removeNodeChangeListener  (NodeChangeListener  ncl  );              Overrides:Preferences      public void  addPreferenceChangeListener  (PreferenceChangeListener  pcl  );             Overrides:Preferences      public void  removePreferenceChangeListener  (PreferenceChangeListener  pcl  );             Overrides:Preferences  // Public Methods Overriding Preferences  public String  absolutePath  ( );        public String[ ]  childrenNames  ( ) throws BackingStoreException;        public void  clear  ( ) throws BackingStoreException;        public void  exportNode  (java.io.OutputStream  os  ) throws java.io.IOException,          BackingStoreException;        public void  exportSubtree  (java.io.OutputStream  os  ) throws java.io.IOException,          BackingStoreException;        public void  flush  ( ) throws BackingStoreException;        public String  get  (String  key  , String  def  );        public boolean  getBoolean  (String  key  , boolean  def  );        public byte[ ]  getByteArray  (String  key  , byte[ ]  def  );        public double  getDouble  (String  key  , double  def  );        public float  getFloat  (String  key  , float  def  );        public int  getInt  (String  key  , int  def  );        public long  getLong  (String  key  , long  def  );        public boolean  isUserNode  ( );        public String[ ]  keys  ( ) throws BackingStoreException;        public String  name  ( );        public Preferences  node  (String  path  );        public boolean  nodeExists  (String  path  ) throws BackingStoreException;        public Preferences  parent  ( );        public void  put  (String  key  , String  value  );        public void  putBoolean  (String  key  , boolean  value  );        public void  putByteArray  (String  key  , byte[ ]  value  );        public void  putDouble  (String  key  , double  value  );        public void  putFloat  (String  key  , float  value  );        public void  putInt  (String  key  , int  value  );        public void  putLong  (String  key  , long  value  );        public void  remove  (String  key  );        public void  removeNode  ( ) throws BackingStoreException;        public void  sync  ( ) throws BackingStoreException;        public String  toString  ( );  // Protected Instance Methods  protected final AbstractPreferences[ ]  cachedChildren  ( );        protected abstract String[ ]  childrenNamesSpi  ( ) throws BackingStoreException;        protected abstract AbstractPreferences  childSpi  (String  name  );        protected abstract void  flushSpi  ( ) throws BackingStoreException;        protected AbstractPreferences  getChild  (String  nodeName  ) throws BackingStoreException;        protected abstract String  getSpi  (String  key  );        protected boolean  isRemoved  ( );        protected abstract String[ ]  keysSpi  ( ) throws BackingStoreException;        protected abstract void  putSpi  (String  key  , String  value  );        protected abstract void  removeNodeSpi  ( ) throws BackingStoreException;        protected abstract void  removeSpi  (String  key  );        protected abstract void  syncSpi  ( ) throws BackingStoreException;  // Protected Instance Fields  protected final Object  lock  ;        protected boolean  newNode  ;   }