Java out-of-bounds error -

i keep getting out of bounds error. want check duplicates. there more after this, right thats important says i'm getting outofboundsexception arraylist, index:1 size:1

arraylist lottery = new arraylist();  (int n = 0; n < 4;) {     int number = 0;     int first = 0;     int value = 0;     boolean found = false;     first = (int) (math.random() * 42 + 1);     lottery.add(first);     count[first]++;      (int = 1; < 6;) {         number = (int) (math.random() * 42 + 1);          (int k = 0; k < 6;) {             // here value = lottery.get(k);             if (value == number) {                 found = true;              } else {                 found = false;             }              if (found == true) {                 number = (int) (math.random() * 42 + 1);              } else {                 k++;              }          }         system.out.println("number " + (i + 1) + ": " + number);         if (found == false) {             lottery.add(number);             count[number]++;             i++;          }      } } 

i assumed count array want check 2 mistakes noticed value parameter never changed stay =0 , in code

 number = (int) (math.random() * 42 + 1);  if (value == number) {       found = true; 

number never equal 0

if (found == false) {     lottery.add(number);     count[number]++;     i++; } 

will executed , adding new element lottery happen twice in each loop , there no n++ basicaly big loop never end , code

first = (int) (math.random() * 42 + 1); 

are sure count length 42 because if less cause indexoutofboundsexception , if more 42 not checking elements in :) hope helped