How to create a random string with 2 specific strings as input in java?

Question

I have a function which takes 2 strings, say userName and password as parameters. I need to generate a random user id with these 2 strings as input. Can anyone suggest a solution ?

generateUserId(String userName, String password)

Thanks

• maasg: do you mean a cryptographic strong hash or is it just some randomized text?
• UmNyobe: yes it depends on the purpose of the id
• Samuel Rossille: The name of your function might reveal a problem: if you intend to identify users by this string, you might have a problem when a user wants to change his password... Either it is badly named or you have a serious design problem.
• Hari: I am new to Java. What i got while searching is the usage of Math.random() . But this doesnot have any dependency with the input strings.
• Dhruv Gairola: what exactly are you trying to accomplish with the user id? wouldn't it make more sense to use an autoincrement with the column of the id?

Answer 1

This might help: http://docs.oracle.com/javase/1.5.0/docs/api/java/util/UUID.html Fiddle around with it.

String res = UUID.nameUUIDFromBytes((password+username).getBytes()).toString();
System.out.println(res);

Answer 2

how about something like this

int seed = userName.hashCode() & password.hashCode(); 
return new String(new Random(seed).nextLong());