Setting text of a JLabel in an array

Question

Hey everyone. Im making a spreadsheet type program, but i have hit a brickwall and for the life of me i can't figure out what is wrong. What i'm trying to do, is check if the input in a cell is in the form e.g "=A3". Then i want the program to goto A3, copy what is in that cell and put it in the active cell. I've done the first bit, which is checking the input is in the form of e.g "=A3" using regex, and that works fine, the actual method doesn't seem to work for me, even though i manage to get the position of A3.
Here is my code:
               String s = inputdata.getText();
          String regexp = "=[A-Z]{1,2}[1-9]{1}[0-9]*";
          if (s.matches(regexp)){
               String temp =  s.substring(1,2);                    //extracts the letter from the regex
               char letter = temp.charAt(0);                         //converts the extracted letter to char indirecting using charAt
               String temp2 = s.substring(2);                         //extracts the number from the regex
               int number = (int)temp2.charAt(0);                    //stores the number from the regex in a int variable this is the row number
               System.out.println(temp);                              
               System.out.println(temp2);
               int ascii = (int)letter;                              //converts the char letter to its ASCII code
               int i = ascii - 64;                                        //gets the number of the column
               System.out.println(i);
               String textHolder = cell[number].getText();     //gets the text in [row][column] typed in
               System.out.println(textHolder);          
               tempcell.setText(textHolder);                         //sets the text of the active cell to the contents of the cell reference entered.
          }I get an arrayindexoutofbounds error.
i don't see why its an array index out of bounds. My array cells is size [51][31]. Tempcell is the current active cell determined by another method.
Any ideas?
Edited by: kev_x on Apr 30, 2008 6:28 AM                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

Answer 1

When you get an index out of bounds error, it tells you what index it tried to access. Like:
ArrayIndexOutOfBoundsException: -1That would mean that you tried to access index -1.
So what does your error tell you?