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System.out.println("На скольких человек необходимо рзделить счет?");
try {
countGuest = scanner.nextInt();
} catch (InputMismatchException er) {
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Удобнее вместо отлавливания ошибки воспользоваться готовым методом scanner.hasNextInt()
String strPriceProduct = scanner.next();
try {
product.price = Double.parseDouble(strPriceProduct);
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У Scanner есть удобный метод hasNextDouble, можно сразу узнать без дополнительных проверок возможно ли интерпретировать строку как double https://docs.oracle.com/javase/1.5.0/docs/api/java/util/Scanner.html#hasNextDouble%28%29
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Консольное приложение No1