// Importing needed libraries
import java.util.Scanner;
import java.util.Random;

// Beginning of AlexanderAssignment4 Class
public class AlexanderAssignment4
{
// Declare a scanner value for input values
public static Scanner inVal = new Scanner(System.in);

// Beginning of Main Method
public static void main(String[] args)
{
   // Declare and set variables
   Random randomValue = new Random();
   int attempts=1;
   int numberCorrectlyAns=0;
   int numberIncorrectAns=0;
   char mathCategory=' ';
   int gradeLevel=0;
   int firstNum=0;
   int secondNum=0;
   int correctMsgVal=0;
   int incorrectMsgVal=0;
   int userAnswer=0;
   int actualAnswer=0;
   int totResps=0;
   double finGrade=0;

   // Prints out the welcome message
   System.out.print("Welcome to Elementary Math Learning Program!\n");
   // Call gradeLvlMenu Method and setting grade level to use
   gradeLevel=gradeLvlMenu();
   if (gradeLevel==0)
   {
         System.out.print("Thank you for using the program!\n");
         System.exit(0);
   }
   // Beginning of while loop for the math category menu
   while(mathCategory!='X')
   {
         // Call mathCatMenu Method and setting which category
         mathCategory=mathCatMenu();
         // Checks to see what grade level is 0 to exit program
         if (gradeLevel==0)
         {
            break;
         }
         // Checks to see what grade level is 1
         if (gradeLevel==1)
         {

Write a program that launches 1,000 threads. Each thread adds 1 to...