public class Formatter { public String correctCost(Double cost) { int remainder = ((int)(Math.floor(cost) % 10)); String formattedCost; if ((cost * 10) - (int)(cost * 10) == 0) { formattedCost = cost + "0"; } else { formattedCost = cost.toString(); } if ((cost > 10 && cost < 15) || remainder == 0 || (remainder > 4 && remainder < 10)) { formattedCost += " рублей"; } else if (remainder == 1) { formattedCost += " рубль"; } else if (remainder > 1 && remainder < 5) { formattedCost += " рубля"; } return formattedCost; } public Double formatDouble(Double doubleToFormat) { String strToDouble = String.format("%.2f", doubleToFormat).replace(",", "."); return Double.valueOf(strToDouble); } }