class RubleUtil { public static String getRublesFormattedString(double amount) { int rubles = (int) amount % 10; if (rubles == 1 && ((int) amount) % 100 != 11) { return "рубль"; } else if (rubles >= 2 && rubles <= 4 && ((int) amount) % 100 < 10 || ((int) amount) % 100 >= 20) { return "рубля"; } else { return "рублей"; } } }