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src/main/java/Main.java
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while (true){
System.out.println("Введите количество гостей");
numberOfGuests = scanner.nextInt();
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hasNextInt
src/main/java/Calculator.java
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public class Calculator {
public static void calculete(int countGuest) {
Scanner scanner = new Scanner(System.in);
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Лучшее переиспользовать инстанс Scanner, а не создавать каждый раз новый.
src/main/java/Calculator.java
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} else {
product.nameProduct += name + "\n ";
System.out.println("Введите стоимость товара (цифрой)");
product.priceProduct += scanner.nextDouble();
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Тоже самое как с hasNextInt только hasNextDouble
corrections
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