I am trying to generate a unique identifier of a fixed length such as the IDs that are generated by Megaupload for the uploaded files.
For example:
- ALGYTAB5
- BCLD23A6
In this example using from A-Z and 0-9 and with a fixed length of 8 the total different combinations are 2,821,109,907,456.
What if one of the generated id is already taken. Those ids are going to be stored in a database and it shouldn't be used more than once.
How can I achieve that in Java?
Thank you.