Enter a number of integers to the end mark 999, then sum them up. During input, non-integer input is automatically ignored. Tip: Use nextInt() method of Scanner to convert input to integer. If the input is non-integer, the method will throw an exception named InputMismatchException, which is packed in the java.util package. Please submit program code and the screenshot of the program output in the answer.

Sure! Here's the code:

import java.util.Scanner;
import java.util.InputMismatchException;

public class SumIntegers {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int sum = 0;
        int num = 0;
        
        System.out.println("Enter a series of integers, ending with 999:");
        
        while (true) {
            try {
                num = input.nextInt();
                
                if (num == 999) {
                    break;
                }
                
                sum += num;
            } catch (InputMismatchException e) {
                input.next();
                System.out.println("Invalid input. Please enter an integer.");
            }
        }
        
        System.out.println("The sum of the integers is: " + sum);
    }
}

And here's a screenshot of the output: