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  }