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This page contains an archived post to the Java Answers Forum made prior to February 25, 2002. If you wish to participate in discussions, please visit the new Artima Forums.
Message:
I would build a List (LinkedList may perform better in this case than ArrayList), not an array, of all the unique values, then use Random to get an index into the list (from 0 to whatever its current size is), remove the value at that index and return it. - mfg
> > You are right that it is possible to get repeats, just by using them on their own. > > I know it sounds inefficient, but you could maintain a vector of "numbers generated so far". Each time you generate a new number, add it to the vector. The inefficiency comes from having to check each vector element and see if the number generated matches any of them. If it does, you will need to generate a new number. > > I will have a think about how it could be done more elegantly.
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