[hardwired]

Code:

import java.util.Random;
import java.util.Scanner;

public class MultiplyTest {
    static Random seed = new Random();
    static Scanner scanner;

    public static void main(String[] args) {
        scanner = new Scanner(System.in);
        multiply();
        scanner.close();
    }

    private static void multiply() {
        int response = 0;

        while(response != -1) {
            int x = 1 + seed.nextInt(10);  // [ 1 <= x <= 10]
            int y = 1 + seed.nextInt(10);
            System.out.print("How much is " + x +
                               " times " + y + " ? : ");
            try {
                response = Integer.parseInt(scanner.nextLine());
            } catch(NumberFormatException e) {
                System.out.println("number format: " + e.getMessage());
            }
            
            while(response != -1 && response != x*y) {
                System.out.print("No. Please try again: ");
                try {
                    response = Integer.parseInt(scanner.nextLine());
                } catch(NumberFormatException e) {
                    System.out.println("number format: " + e.getMessage());
                }
            }

            if(response != -1)
                System.out.println("Very Good");

        }
    }
}