Java スキャナーが NoSuchElementException をスローするのはなぜですか? それを修正するにはどうすればよいですか?

import java.util.Scanner;

public class Addition {
  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);

    int number1; // first number to add
    int number2; // second number to add
    int sum; // sum of 1 & 2

    // Problem: Reading input values without checking for input availability

    System.out.print("Enter First Integer: ");
    number1 = input.nextInt(); // Exception occurs here when no input is provided

    System.out.print("Enter Second Integer: ");
    number2 = input.nextInt(); // Exception occurs here if input is not available for this prompt

    sum = number1 + number2; // Addition occurs, assuming input values are available

    System.out.printf("Sum is %d\n", sum); // Displays the sum, if input is available
  }
}

if (input.hasNextInt()) {
  number1 = input.nextInt();
} else {
  // Handle the case where no input is provided
}