      1  import java.util.Arrays;

      2

      3  public class SwapHalves

      4  {

      5     public static void main(String[] args)

      6     {

      7        int[] values = { 9, 13, 21, 4, 11, 7, 1, 3 };

      8

      9        int i = 0;

     10        int j = values.length / 2;

     11        while (i < values.length / 2)

     12        {

     13           // Swap values at positions i and j

     14           int temp = values[i];

     15           values[i] = values[j];

     16           values[j] = temp;

     17

     18           i++;

     19           j++;

     20        }

     21

     22        System.out.println(Arrays.toString(values));

     23     }

     24  }