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Scanner scanner = new Scanner(System.in);
while (true) {
System.out.println("Введите количество гостей.");
int number = scanner.nextInt();
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Пользователь может ввести на вопрос про количество человек вместо целого числа строку, и приложение упадет. Для стоимости товаров ты обрабатываешь такую ситуацию, стоит добавить обработку и для количества людей, чтобы приложение не падало/ Можешь использовать try-catch или hasNextInt
public class Calculator {
static Scanner scanner = new Scanner(System.in);
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Все поля и методы класса лучше делать не статическими (убрать static у всех), в этом нет необходимости. А при вызове метода в Main создавать объект класса:
Calculator calc = new Calculator();
calc.printResult(numberOfGuests);
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