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.

     *
     * @see #save(java.lang.String)
     */
    public void load(String preferencesKey) throws BackingStoreException {
        Preferences prefs = Preferences.userRoot().node(preferencesKey);
        String[] keys = prefs.keys();
        if (keys != null) {
            for (String key : keys) {
                if (key.charAt(1) == '_') {
                    // Try loading using new method
                    switch (key.charAt(0)) {

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    }


    private void readPreferences() {
        Preferences preferences = Preferences.userNodeForPackage(RSTAEditor.class);
        try {
            String[] keys = preferences.keys();
            for (String key : keys) {
                String value = preferences.get(key, null);
                handlePreference(key, value);
            }
        } catch (BackingStoreException e) {

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     * preferences.
     */
    private void loadFileNames() {
        Preferences p = Preferences.userNodeForPackage(this.getClass());
        try {
            String[] keys = p.keys();
            for (int i = 0; i < keys.length; i++) {
                String fName = p.get("dirName" + i, null);
                if (fName == null)
                    continue;
                File file = new File(fName);

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            Preferences jxl = prefs.node("autoupdate/jxl");
            for (int i = 0; i < files.length; i++) {
                File file = files[i];
                jxl.put("file" + i, file.getAbsolutePath());
            }
            for (int i = files.length, n = jxl.keys().length; i < n; i++) {
                jxl.remove("file" + i);
            }
        } catch (BackingStoreException e) {
        }
    }

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    }


    public File[] getAutoUpdateJXLs() {
        try {
            Preferences jxls = prefs.node("autoupdate/jxl");
            String[] keys = jxls.keys();
            List fileList = new ArrayList();
            for (int i = 0; i < keys.length; i++) {
                fileList.add(new File(jxls.get(keys[i], null)));
            }
            return (File[]) fileList.toArray(new File[fileList.size()]);

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    }


    private void populateFileHistory() {
        try {
            Preferences fileHistory = prefs.node("filehistory");
            String[] keys = fileHistory.keys();
            Arrays.sort(keys);
            for (int i = 0; i < keys.length; i++) {
                fileHistoryList.add(new File(fileHistory.get(keys[i], null)));
            }
        } catch (BackingStoreException e) {

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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);
        }

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


        try {
            keys = classLoaderPreference.keys();
            for (String cpKey : keys) {
              values.add(classLoaderPreference.get(cpKey, ""));
            }
        }
        catch (BackingStoreException e) {

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                if (!equalsPath(oldNode, childNode)) {
                    // path to node
                    String path = childNode.absolutePath().replace(oldPath, newPath);


                    // copy all preferences in this node
                    String[] names = childNode.keys();
                    Preferences newPref = Preferences.userRoot().node(path);
                    for (int i = 0; i < names.length; i++) {
                        newPref.put(names[i], childNode.get(names[i], ""));
                    }
                    prefChild.add(newPref);

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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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