HW7.18

 public class Solution
 {
     public static void main(String[] args)
     {
         int[][] m = {{1, 2}, {3, 4}, {5, 6}, {7, 8}, {9, 10}};

         shuffle(m);

         for(int i = 0; i < m.length; i++)
         {
             for(int j = 0; j < m[0].length; j++)
                 System.out.print(m[i][j] + " ");
             System.out.println();
         }
     }

     public static void shuffle(int[][] array)
     {
         for(int i = 0; i < array.length; i++)
         {
             int randomLocation = (int)(Math.random() * array.length);
             int[] temp = new int[array[0].length];
             for(int j = 0; j < array[0].length; j++)
             {
                 temp[j] = array[i][j];
                 array[i][j] = array[randomLocation][j];
                 array[randomLocation][j] = temp[j];
             }
         }
     }
 }