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, ""));
}
}
}