Java: Print first, fourth, seventh... of an array using only ONE LOOP? -

given array of integer.

i want first print print 1st, 4th, 7th.. numbers. 2nd, 5th, 8th.. , 3rd, 6th, 9th..

i want use 1 loop iterate through array. how can this?

(note: size of array 4, 7, 10, 13.. , on, i.e. in increments of 3.)

thanks.

write function

private int index(int i, int length) 

which computes right index loop variable i

edit

wasn't easy first thought:

public static void main(string[] args) {      int[] array = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 };     (int = 0; < array.length; i++) {          system.out.println(array[index(i, array.length)]);     } }  private static int index(int i, int length) {      int third = (length + 2) / 3;     if (length % 3 == 1 && >= third) { // spezial, because second third smaller         return index(i - 1, length - 1);      }      int group = % third;      return (group) * 3 + (i / third); } 

edit did cleanup;