Thread: Generate random numbers between 1 and 52 by passing a seed to Random.

Hi,

I have to generate random numbers to shuffle a deck of 52 cards. I am using below code:

 
import java.util.Random;
 
for (int i = 0; i < 52; i++) {
long seed = System.currentTimeMillis();
Random random = new Random(seed);
int i = random.nextInt(52);
}

But I am getting duplicate random numbers as the seed having same value for the next iterations.

Please help to fix this.

Regards,
Shareef

Erm, it's called random. You're never safe not to get duplicates. Maybe you could fill an int array with numbers from 1 - 52 and shuffle it?

A seed is used too set a pseudo random generator to a specific state.
So if you create two Random objects with the same seed it will repeat the same random sequence.
This usefull if you need something to be repeatable, but i am guessing that is not what you want.
Try reading the javadoc for the seed constructor of Random again

Hint: only create one seeded Random object and reuse it.

Rolf