shared preferences in android sample ?

public static void saveStringPrefrence(String key, String value,
Context context) {
SharedPreferences prefs = PreferenceManager
.getDefaultSharedPreferences(context);
Editor edit = prefs.edit();
edit.putString(key, value);
edit.commit();
}

public static String getPrefrenceValue(String key, Context context) {
SharedPreferences prefs = PreferenceManager
.getDefaultSharedPreferences(context);
String string = prefs.getString(key, "");
return string;
}