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Davanum Srinivas

import java.util.prefs.*;
import java.io.*;

public class ExportPrefs {

    public static final String APPLICATIONPATH = "applicationpath";
    public static final String USERFONT = "userfont";
    public static final String LASTUSERLOGIN = "lastuserlogin";

    public void go() throws BackingStoreException {

        try {
            Preferences preferences =
                Preferences.userNodeForPackage(this.getClass());

            preferences.put(APPLICATIONPATH, "c:application");
            preferences.put(USERFONT, "Courier New");
            preferences.put(LASTUSERLOGIN, "Joris Van den Bogaert");
            preferences.flush();
        } catch (BackingStoreException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public static void main(String[] args) throws Exception {
        ExportPrefs exportPrefs = new ExportPrefs();
        exportPrefs.go();
    }
}

More information can be found at:
Working with preferences