Selecting Random Integer from int[]

Question

Hi,
I have created an integer array. I have a for loop which will add values to the array if the condition is met. I then want to select one of the values in the array to use at random. Would anyone be able to help.
Thanks
Sohaib

Answer 1

you have to use an ArrayList to add objects once an array is declared its items can not be change plus ArrayList is much more useful for this problem
import the ArrayList class and the Random class with the statements
import java.util.ArrayList;
import java.util.Random;then you can create a new ArrayList and Random such as
ArrayList <int> randomNumbers = new ArrayList <int> ();
Random rnd = new Random();you can add new values at random with a method such as
public ArrayList setRandomNumbers(){
if (+condition+){
randomNumbers.add(+index+, rnd.nextInt(+highest number desired plus one here+)
}or if you want to assign a number instead of one at random use
randomNumbers.add(+index+,+number+)then you can reference them at random using:
randomNumbers.get(rnd.nextInt(number of elements -1));You can find more ArrayList methods at
[java.util.ArrayList|http://java.sun.com/j2se/1.3/docs/api/java/util/ArrayList.html]
Edited by: DJDJ on Apr 2, 2008 8:46 AM
Edited by: DJDJ on Apr 2, 2008 8:47 AM