setting array dimensions at runtime

[user]

Hello,

I've been wondering what the easiest way is to set
the dimension of an array during runtime.

You can't write

   byte[][] a = new byte[size][size];

because the compiler will give an error. The only
thing I've been able to think of is

   byte[][] a;
   a.length = size;
   for (int i; i < size; i++) {
        a[i].length = size;
   }

But it's slower (and less convenient) than
writing

   byte[][] a = new byte[9][9];