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

do you mean a cryptographic strong hash or is it just some randomized text? — maasg
– maasg, Commented Jun 1, 2012 at 9:35
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. — Samuel Rossille
– Samuel Rossille, Commented Jun 1, 2012 at 9:38
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. — Hari
– Hari, Commented Jun 1, 2012 at 9:39
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? — Dhruv Gairola
– Dhruv Gairola, Commented Jun 1, 2012 at 9:41

nullpotent · Accepted Answer · 2012-06-01 09:41:42Z

2

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);

answered Jun 1, 2012 at 9:41

nullpotent

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Comments

juergen d · Accepted Answer · 2012-06-01 09:47:48Z

1

how about something like this

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

edited Jun 1, 2012 at 9:47

answered Jun 1, 2012 at 9:35

juergen d

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