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

java.util.prefs.Preferences.clear()
Removes all of the preferences (key-value associations) in this preference node. This call has no effect on any descendants of this node.
If this implementation supports stored defaults, and this node in the preferences hierarchy contains any such defaults, the stored defaults will be "exposed" by this call, in the sense that they will be returned by succeeding calls to get. @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 #removeNode()

 */
public class ClearGuiSaveState {


    public static void main(String args[]) throws BackingStoreException {
        Preferences p = Preferences.userNodeForPackage(GUISaveState.class);
        p.clear();
    }


}

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    protected void store() {
        Preferences prefs = getPreferences();


        // clear the backing store
        try {
            prefs.clear();
        } catch (BackingStoreException ex) {
        }


        for (int i = 0; i < mruFileList.size(); i++) {
            String str = mruFileList.get(i);

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        prefs.put(key, getCheckVal(clob));


        // Create a child node specifically for "clob storage" for this key
        Preferences p = getClobStorage(prefs, key);
        try {
            p.clear();
        } catch (BackingStoreException bse) {
            // it would be nice to clear all data underneath the clob storage
            // node since it might reduce our resource utilization.  But even
            // if this fails, the code below ought to cover our bases.
        }

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        try {
            Preferences preferences_node = getPreferencesNode();
            ByteArrayOutputStream backup = new ByteArrayOutputStream();
            preferences_node.exportSubtree(backup);
            preferences_node.clear();


            // now load in the preferences
            try {
                Preferences.importPreferences(config_file_input_stream);

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        Preferences prefNode = getPreferencesNode();
        String securityToken = prefNode.get(AgentConfigurationConstants.AGENT_SECURITY_TOKEN, null);
        ByteArrayOutputStream backup = new ByteArrayOutputStream();
        prefNode.exportSubtree(backup);
        prefNode.clear();


        // now load in the preferences
        try {
            ByteArrayOutputStream rawConfigFile = new ByteArrayOutputStream();
            InputStream rawConfigInputStream = configFile.openStream();

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            if (default_prefs != null) {
                default_prefs.clear();
            }


            if (test_prefs != null) {
                test_prefs.clear();
            }


            File dataDir = new File(AgentConfigurationConstants.DEFAULT_DATA_DIRECTORY);


            if (dataDir != null) {

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        // because otherwise the agent will not be able to re-register with any previous name is was registered with.
        Preferences preferencesNode = getPreferencesNode();
        String securityToken = preferencesNode.get(AgentConfigurationConstants.AGENT_SECURITY_TOKEN, null);
        ByteArrayOutputStream backup = new ByteArrayOutputStream();
        preferencesNode.exportSubtree(backup);
        preferencesNode.clear();


        // now load in the preferences
        try {
            ByteArrayOutputStream raw_config_file = new ByteArrayOutputStream();
            StreamUtil.copy(config_file_input_stream, raw_config_file, true);

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        int startPort = getStartPort();


        for (int i = 0; i < count; i++) {
            // get the spawned agent's config and clear it out of any old config that might still exist
            Preferences prefs = getPreferencesNode(i);
            prefs.clear();


            // start out by giving the spawned agent the template configuration
            for (String key : templatePrefs.keys()) {
                prefs.put(key, templatePrefs.get(key, "**SHOULD NEVER SEE THIS**"));
            }

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        // we'll restore the original values in that case.


        Preferences preferencesNode = getTemplatePreferencesNode();
        ByteArrayOutputStream backup = new ByteArrayOutputStream();
        preferencesNode.exportSubtree(backup);
        preferencesNode.clear();


        // now load in the preferences
        try {
            Preferences.importPreferences(configFileInputStream);

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     */
    public void save(Preferences preferences) {


        Preferences recentNode = preferences.node(SETTINGS_RECENT_WORKSPACES);
        try {
            recentNode.clear();
        } catch (BackingStoreException e) {
        }
        int count = 0;
        Iterator it = recentWorkspaces.iterator();
        while (it.hasNext()) {

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