File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Java Micro Edition and the fly likes util.Random problems (?) Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Mobile » Java Micro Edition
Bookmark "util.Random problems (?)" Watch "util.Random problems (?)" New topic

util.Random problems (?)

Svend Rost
Ranch Hand

Joined: Oct 23, 2002
Posts: 904

Im fooling around with a small particle engine for J2ME, and
for each particle (in the particle flock) I need to generate
a beginning x and y value, and an "update/speed vector" (xi,yi) with the
help of Random.

Emperical tests shows, that the particles tend to flock together.
I suspect, that util.Random "reuses" the generated values..

does anyone have any info on the above?

In general about the engine:

loop thru' the flock of particles:
if particle p is active -> p.update
else reset p

x= x + xi
y= y + yi

sets the x,y,xi and yi values with random.nextInt() % 3

/Svend Rost
I agree. Here's the link:
subject: util.Random problems (?)
It's not a secret anymore!