How can I fix the size of randomly generated numbers ?

[Shounak Kundu]

Hi,
I am randomly generating numbers using java.util.Random . But, I can not keep the length of the numbers fixed. Can you help me please ?

Here's my code :

package testShounak;

import java.util.Random;
/**
 * @author Shounak
 *
 */
public class RandomNum {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Random random = new Random();
		for(int i=0;i<10;i++)
		{
			//int generatedNum = random.nextInt(1000000000);
			
			System.out.println(" Generated number is  : "+random.nextInt(100000000));
		}
	}

}

[Maneesh Godbole]

By length of number, I take it you mean the number of digits in the number.

Suppose you want only 3 digit numbers. The lowest would be 100 and highest would be 999
In pseudo code
1) Generate nextInt(1000)
2) Check if num >99. If yes, accept it, else reject it
3) Repeat

[Campbell Ritchie]

. . . or myRandom.nextInt(900) + 100

[Maneesh Godbole]

Campbell's solution is more elegant.
Now why didn't I think of it?

[Shounak Kundu]

thank you guys...... it has been solved...

[Campbell Ritchie]

You're welcome