Java error: cannot find symbol -

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help don't know do, why i'm getting error.

score.java:44: cannot find symbol symbol  : class invalidtestscore location: class score         catch (invalidtestscore e)                ^ 1 error    // george beazer  import javax.swing.*;  import javax.swing.joptionpane;  public class score      {          public static void main(string[] args)      {          int numberoftests = 0;           double[] grade = new double[numberoftests];           double startgrade = 0;           int x = 1 ;           string strinput;           // how many tests used           strinput = joptionpane.showinputdialog(null, "how many tests have? ");          numberoftests = integer.parseint(strinput);           grade = new double[(int) numberoftests];                     {              (int index = 0; index < grade.length; index++)          {               strinput = joptionpane.showinputdialog(null, "enter test score." + (index + 1));              grade[index] = double.parsedouble(strinput);               if (grade[index] < 0 || grade[index] > 100 )              {                  try                  {                        x=1;                 }           catch (invalidtestscore e)              {                      e.printlnstacktrace();                     system.out.println ("choose test score between 0 , 100");             }              }              else             {                 x=2;             }           {                system.out.println ("choose test score between 0 , 100");          }      }   }          while (x==1);           (int index = 0; index < grade.length; index++ )           {              startgrade += grade[index];          }           double average = startgrade/grade.length;           system.out.println("the average is: " + average);   }  }

it telling class invalidtestscore not found. have imported it?


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