checking if input from scanner is int with while loop java

Question

I basically want the following while loop to check if the input is an integer. It cannot contain decimals because it is pointing to an array. If the value entered is a decim

Answer 1

Check that the input is integer with hasNextInt() before you call nextInt(). Otherwise nextInt() throws an InputMismatchException when user types a non integer.

int monthInput;

System.out.print("Enter month (valid values are from 1 to 12): ");
Scanner monthScan = new Scanner(System.in);

if (monthScan.hasNextInt()) {
    monthInput = monthScan.nextInt();
} else {
    monthScan.next();   // get the inputted non integer from scanner
    monthInput = 0;
}

// If the month input is below 1 or greater than 12, prompt for another value
while (monthInput < 1 || monthInput > 12) {
    System.out.print("Invalid value! Enter month (valid values are from 1 to 12): ");
    if (monthScan.hasNextInt()) {
        monthInput = monthScan.nextInt();
     } else {
       String dummy = monthScan.next();
       monthInput = 0;
    }
}