public static void shuffleArray(int[] ar)
    {
        Random rnd = new Random();
        for (int i = ar.length - 1; i > 0; i--)
        {
            int index = rnd.nextInt(i + 1);
            // Simple swap
            int a = ar[index];
            ar[index] = ar[i];
            ar[i] = a;
        }
    }
public static void shuffleArray ( int [ ] ar ) { Random rnd = new Random ( ) ; for ( int i = ar . length - 1 ; i > 0 ; i -- ) { int index = rnd . nextInt ( i + 1 ) ; int a = ar [ index ] ; ar [ index ] = ar [ i ] ; ar [ i ] = a ; } }
Fisher–Yates shuffle

@param ar