Using a MergeSort with an Array List

Question

Hi. I'm working on a program that does a MergeSort using an array list. The user is asked to enter 2 arrays of increasing numbers, and my program will create a 3rd array that merges the 2 original ones.
I think I've almost got it down, but I seem to be running into an OutOfBounds error, and I'm not sure why. I've tried changing the initial values of some of my variables to no avail.
I'm kinda new to Java so be gentle.
import java.util.ArrayList;
import cs1.Keyboard;
import java.util.*;
public class MergeSort3
     public static void main (String[] args)
          ArrayList<Integer> ary1 = new ArrayList<Integer>();
          ArrayList<Integer> ary2 = new ArrayList<Integer>();
          ArrayList<Integer> ary3 = new ArrayList<Integer>();
          int input=0, count=0, ary1count=0, ary2count=0, temp=0;
          boolean ok=true;
          while(ok)
               System.out.println("Enter integers in Array1 from smallest to largest. (-1 to stop): ");
               input = Keyboard.readInt();
               if(input==-1)
                    ok=false;
               else
                    ary1.add(input);
          ok=true;
          while(ok)
               System.out.println("Enter integers in Array2 from smallest to largest. (-1 to stop): ");
               input = Keyboard.readInt();
               if(input==-1)
                    ok=false;
               else
                    ary2.add(input);
          System.out.println("Size of array 1: "  + ary1.size());
          System.out.println("Size of array 2: "  + ary2.size());
          int ary3size=ary1.size()+ary2.size();
          System.out.println(ary3size);
          while(count<ary3size)
               if(ary1.get(ary1count)<=ary2.get(ary2count) && ary1count<ary1.size() && ary2count<ary2.size())
                    ary3.add(ary1.get(ary1count));
                    ary1count++;
                    count++;
                    System.out.println(ary3);
               else
                    temp=ary2.get(ary2count);
                    ary3.add(temp);
                    ary2count++;
                    temp=0;
                    count++;
               while(ary1count>=ary1.size() && ary2count<ary2.size())
                    ary3.add(ary2.get(ary2count));
                    ary2count++;
          System.out.println(ary3);
}

Answer 1

We can't run the program since you're using a non-standard class, csi.Keyboard.
Reduce the problem to a program that only uses standard Java classes, post the new program, AND identify the line that's throwing the error (not just the line number!) and post the exact error message.