import java.util.prefs.Preferences; public class PreferenceExample { public static void main(String args[]) throws Exception { Preferences prefsRoot = Preferences.userRoot(); Preferences myPrefs = prefsRoot.node("PreferenceExample"); myPrefs.put("A", "a"); myPrefs.put("B", "b"); myPrefs.put("C", "c"); for (String s : myPrefs.keys()) { System.out.println("" + s + "= " + myPrefs.get(s, "")); } } }