Efficient method to generate UUID String in Java (UUID.randomUUID().toString() without the dashes)

I would like an efficient utility to generate unique sequences of bytes. UUID is a good candidate but UUID.randomUUID().toString() generates stuff like 44e128a5-ac7a-4c9a-be4c-224b6bf81b20 which is good, but I would prefer dash-less string.

I’m looking for an efficient way to generate a random strings, only from alphanumeric characters (no dashes or any other special symbols).