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 {
      if ((getPreferences(wikipedia) != null) &&
          (getPreferences(wikipedia).nodeExists(property)) &&
          (getPreferences(wikipedia).nodeExists(property + "/" + subProperty))) {
        Preferences node = getPreferences(wikipedia).node(property + "/" + subProperty);
        String[] children = node.keys();
        for (String child : children) {
          values.setProperty(child, node.get(child, ""));
        }
      }
    } catch (BackingStoreException e) {

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      EnumWikipedia wikipedia, String property) {
    List<String> result = new ArrayList<String>();
    if (getPreferences(wikipedia) != null) {
      try {
        Preferences node = getPreferences(wikipedia).node(property);
        String[] children = node.keys();
        for (int i = 0; i < children.length; i++) {
          result.add(node.get(children[i], ""));
        }
      } catch (BackingStoreException e) {
        //

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        String nodeName = property + "/" + subProperty;
        if (!getPreferences(wikipedia).nodeExists(nodeName)) {
          return result;
        }
        Preferences node = getPreferences(wikipedia).node(nodeName);
        String[] children = node.keys();
        for (int i = 0; i < children.length; i++) {
          result.add(node.get(children[i], ""));
        }
      } catch (BackingStoreException e) {
        //

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          if (Modifier.isPublic(m.getModifiers()) &&
              m.getName().startsWith("set") &&
              (m.getGenericParameterTypes().length == 1)) {
            String parameterName = "" + Character.toLowerCase(m.getName().charAt(3)) + m.getName().substring(4);
            boolean exist = false;
            for (String key : node.keys()) {
              if (parameterName.equals(key)) {
                exist = true;
              }
            }
            if (exist) {

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            if (Modifier.isPublic(m.getModifiers()) &&
                m.getName().startsWith("set") &&
                (m.getGenericParameterTypes().length == 1)) {
              String parameterName = "" + Character.toLowerCase(m.getName().charAt(3)) + m.getName().substring(4);
              boolean exist = false;
              for (String key : node.keys()) {
                if (parameterName.equals(key)) {
                  exist = true;
                }
              }
              if (exist) {

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        Principal userPrincipal = createPrincipal(user.getSubject(), UserPrincipal.class);             
        this.principal = userPrincipal.getName();
        try
        {
            Preferences userAttributes = user.getUserAttributes();
            String[] keys = userAttributes.keys();
            for (int ix = 0; ix < keys.length; ix++)
            {
                attributes.add(new StringAttribute(keys[ix], userAttributes.get(keys[ix], "n/a")));
            }
        }

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        recentWorkspaces.clear();


        TreeMap numberToFile = new TreeMap();
        Preferences recentNode = preferences.node(SETTINGS_RECENT_WORKSPACES);
        try {
            String[] keys = recentNode.keys();
            for (int i = 0; i < keys.length; i++) {
                String key = keys[i];
                String fileName = recentNode.get(key, null);
                if (fileName != null) {
                    numberToFile.put(new Integer(key), fileName);

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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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    p.getDouble(null, 0.1);
    p.getInt(null, 1);
    p.getLong(null, 1l);
    p.isUserNode();
    try {
      p.keys();
    } catch (BackingStoreException e) {
    }
    p.name();
    p.node(null);
    try {

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        {
          final Properties props = new Properties();
          if (p.nodeExists("properties"))
          {
            final Preferences preferences = p.node("properties");
            final String[] strings = preferences.keys();
            for (int j = 0; j < strings.length; j++)
            {
              final String string = strings[j];
              final String value = preferences.get(string, null);
              if (value != null)

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