import java.util.prefs.*;
public class SetPreferences {
public static String USAGE =
"Usage: java SetPreferences <class> <pref> <val>";
public static void main(String[] args) throws ClassNotFoundException {
if (args.length!=3) {
System.err.println(USAGE);
System.exit(1);
}
Preferences prefs =
Preferences.userNodeForPackage(Class.forName(args[0]));
String oldVal = prefs.get(args[1],null);
if (oldVal!=null) {
System.out.println("Ancienne valeur : " + oldVal);
} else {
System.out.println("Ancienne valeur vide");
}
prefs.put(args[1],args[2]);
System.out.println("La valeur de " + args[1] +
" est maintenant : " + args[2]);
}
}