1.  String[] s1 = new String[Xpos.length];
      for(int i = 0; i < Xpos.length; i ++)
      {
         s1[i] = str(Xpos[i]);
      }
     saveStrings("Xpoints.csv", s1);
     String[] s2 = new String[Ypos.length];
      for(int i = 0; i < Ypos.length; i ++)
      {
         s2[i] = str(Ypos[i]);
      }
     saveStrings("Ypoints.csv", s2);

I know need it to load these files from the CSV's, however I am unsure how I would reverse the procces. I also think I will need to append the arrays for every value in the CSV as both arrays are declared as such:

int[] Xpos = new int [0];
int[] Ypos = new int [0];