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Vectors again

2 replies on 1 page. Most recent reply: Jan 13, 2003 2:24 PM by Martin

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Martin

Posts: 3
Nickname: muper
Registered: Jan, 2003

Vectors again

Posted: Jan 12, 2003 4:32 PM

The general problem that I have, is to get random numbers into a [ ] - vector, without using the same numbers twice. I want to get the numbers 1-20 into the vector, but not in the numerical order.
Could anyone please tell me how to do this?
Thankful for answers...

Oliver

Posts: 12
Nickname: lazycat
Registered: Dec, 2002

Re: Vectors again

Posted: Jan 13, 2003 12:40 AM

public class RandomVector{
static private java.util.Set vec = new java.util.LinkedHashSet();
static int[] getRandomVector(int size){
java.util.Random rd = new java.util.Random();

while(vec.size() < size){
int tmp = rd.nextInt(size) + 1;
vec.add(new Integer(tmp));
}

Object o[] = vec.toArray();
int a[] = new int[o.length];

for(int i = 0; i < a.length; i++)
a = ((Integer)o).intValue();

return a;
}
}

class TestRV {
public static void main(String args[]){
int a [] = RandomVector.getRandomVector(20);

for(int i = 0; i < a.length; i++)
System.out.println(a);

}
}

Martin

Posts: 3
Nickname: muper
Registered: Jan, 2003

Re: Vectors again

Posted: Jan 13, 2003 2:24 PM

ok, thanks a lot!

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