Examples of java.util.prefs.Preferences.keys()

java.util.prefs.Preferences.keys()
Returns all of the keys that have an associated value in this preference node. (The returned array will be of size zero if this node has no preferences.)
If the implementation supports stored defaults and there are any such defaults at this node that have not been overridden, by explicit preferences, the defaults are returned in the array in addition to any explicit preferences. @return an array of the keys that have an associated value in thispreference node. @throws BackingStoreException if this operation cannot be completeddue to a failure in the backing store, or inability to communicate with it. @throws IllegalStateException if this node (or an ancestor) has beenremoved with the {@link #removeNode()} method.

    {
        try
        {
            Preferences descNode = prefNode.node("description");
           
            String[] keys = descNode.keys();
            ArrayList descs = new ArrayList(keys.length);
            for(int i=0; i < keys.length; i++)
            {
                PreferenceDescriptionImpl desc = new PreferenceDescriptionImpl();
                String localeKey = keys[i];

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      Map userInfo = new HashMap();
      User user =  userManager.getUser(username);
    if(user != null)
    {
          Preferences userPrefs = user.getUserAttributes();
          String[] userPrefKeys = userPrefs.keys();
        
          for(int i = 0; i<userPrefKeys.length; i++)
          {
            userInfo.put(userPrefKeys[i], userPrefs.get(userPrefKeys[i], "No value"));                    
          }

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        // No property has been defined nor added to the node. This should return
        // the property value
        Preferences pref0 = Preferences.userRoot();
        try
        {
            String[] propertyKeys = pref0.keys();
            if (propertyKeys.length > 0)
            {
                assertTrue("expected no children, " + propertyKeys.length + ", " + propertyKeys[0],
                        propertyKeys.length == 0);
            }

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        assertTrue("expected prop1 == true, " + prop1, prop1.equals("true"));


        // There should be 1 property under pref1.
        try
        {
            String[] propertyKeys = pref1.keys();
            assertEquals("expected 1 child, ", 1, propertyKeys.length);
        }
        catch (BackingStoreException bse)
        {
            assertTrue("backing store exception: " + bse, false);

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                // Loading the userinfo
                User user = userManager.getUser(principal.getName());
                if(user != null)
                {
                  Preferences prefs = user.getUserAttributes();
                  String[] prefKeys = prefs.keys();
                  Map prefsSet = new HashMap();
                  for(int i = 0; i<prefKeys.length; i++)
                  {
                    prefsSet.put(prefKeys[i], prefs.get(prefKeys[i], "No value"));                    
                  }

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        Collection details = new ArrayList<String>();
        String[] keys = null;


        try {
            keys = classLoaderPreference.keys();
        }
        catch (BackingStoreException e) {
            // do nothing
        }

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    public static List<String> getLastProjFiles() {
        Preferences filesPrefs = getLastProjFilesPref();
        ArrayList<String> arrayLastProjFiles = new ArrayList<String>();
        String[] keys = null;
        try {
            keys = filesPrefs.keys();
        }
        catch (BackingStoreException e) {
            logObj.warn("Error reading preferences file.", e);
        }
        if (keys != null) {

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        assertEquals("8value", mock1.get("/K/E\\Y\\abc~@!#$%^&*(\\", null));
        assertNull(mock1.get("/k/e/y", null));
        assertEquals("7value", mock1.get("/K/E/Y", null));
        assertEquals("1value", mock1.get("key", null));


        String[] keys = mock1.keys();
        assertEquals(4, keys.length);
        for (int i = 0; i < keys.length; i++) {
            String key = keys[i];
            assertTrue("key".equals(key) || "KEY".equals(key)
                    || "/K/E/Y".equals(key)

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        }
      }
      Preferences forModule = NbPreferences.forModule(FavouritesPanel.class);
      try
      {
        for(String key : forModule.keys())
        {
          if(forModule.get(key, "").equals(selectedValue.getLink()))
          {
            forModule.remove(key);
          }

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  {
    PageListModel model = new PageListModel();
    Preferences forModule = NbPreferences.forModule(FavouritesPanel.class);
    try
    {
      for(String key : forModule.keys())
      {
        model.addElement(new Page(forModule.get(key, "")));
      }
    }
    catch(BackingStoreException ex)

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