Problem during runtime....

Question

hi.. can someone help me with a simple program i am creating... Its a program for getting 6 lucky random numbers... everytime i try and run the program, it is able to run, but when i click the button to start to get the random numbers, a problem comes up in the background command line window. However, if i disable the method numberGone( ) method, which checks to make sure no numbers picked are repeated, everything works fine...
i really can't figure out what is wrong... so hope someone can help me download the 2 source files and test it out for me... here are the 2 sourcefiles...
http://www.aqcy/net/hwz/QuickPick.java (events and logic is handled here)
http://www.aqcy.net/hwz/TotoQuickPick.java (this is the the GUI and main program)

Answer 1

ok, i try my best to describe the error here...
i suspect that the code which caused the error is the numberGone method used to check for repeating numbers being genetrated.
boolean numberGone(int num, JTextField[] pastNums, int count) {
for (int i = 0; i < 6; i++) {
if (Integer.parseInt(pastNums.getText()) == num)
return true;
return false;
the above code checks if the number has been repeated or not if it has been repeated, true will be returned and the do-while loop will be called again until false is returned.
the do-while loop is below...
void startPicking() {
     for (int i = 0; i < 6; i++) {
          int ball;
          do {
               ball = (int) Math.floor(Math.random() * 45 + 1);
          } while (numberGone(ball, tt.numbers, i));
          tt.numbers[i].setText("" + ball);
so, whenever i try to the program, once i click the button to start random picking the numbers, this error will appear: http://www.aqcy.net/error.jpg
once i disable the do-while loop and checking for repeat numbers method, the error is gone...