public class Calculator { private double check = 0; private Product product; private Guest guest; public Calculator(Product product, Guest guest) { this.product = product; this.guest = guest; } public void cheakCalcForm() { check = product.sum / guest.guests; double checkF = Math.floor(check); int checkO = (int) checkF % 10; switch (checkO) { case 1: System.out.println(String.format("%.2f", check) + " рубль"); break; case 2: case 3: case 4: System.out.println(String.format("%.2f", check) + " рубля"); break; default: System.out.println(String.format("%.2f", check) + " рублей"); break; } } }