Writing endDocument

   public void endDocument()
   {
      float Ave = 0;
      int i = 0, j = 0;
      System.out.println("Grades");
      for(i = 0; i < nstudent ; i++){
         float total = 0;
         for(j = 0; j < 4; j++){
            total += grades[i][j];
         }		
         grades[i][4] = total/4;
         Ave += grades[i][4];
         System.out.println("Student " + i + "=" + grades[i][4]);
      }
      Ave /= nstudent;
      System.out.println("Class Average = " + Ave);
   }