public class Formatter { public String getRubblies(double rub) { double lastDigit; double cel = Math.floor(rub); if (cel >= 100 && cel % 100 >= 11 && cel % 100 <= 19) return "рублей"; else if (cel>=11 && cel<=19) return "рублей"; else if (cel >= 10) lastDigit = cel % 10; else lastDigit = cel; switch ((int) lastDigit) { case 1: return "рубль"; case 2: case 3: case 4: return "рубля"; } return "рублей"; } public String getFormatDouble(double summ) { return String.format("%.2f", summ); } }