File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Beginning Java and the fly likes random numbers gen Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "random numbers gen" Watch "random numbers gen" New topic

random numbers gen

j srinivas

Joined: Apr 08, 2008
Posts: 16
well iam unable to create random numbers betn 1-100,without repetetion.
iam declaring an array to store all random numbers.
then generate an array number and compare it with array elements
but it is not getting done
Ulf Dittmer

Joined: Mar 22, 2005
Posts: 42965
Is there a particular reason you're not using java.util.Random.nextInt ? It's not easy to program a good RNG on your own.
Alberto Caraz

Joined: Apr 27, 2007
Posts: 18
By without repetition you mean you want to randomly permute a sequence of numbers and then show them one by one? If that's the case I would recommend creating a list of numbers from 1 to n and then calling Collections.shuffle on it. Then your "ith" random number will be the "ith" element of this sequence.
jQuery in Action, 3rd edition
subject: random numbers gen
It's not a secret anymore!