Random numbers

[logan]

Hi!
I want to generate random numbers between 0-80. The no. generated should be unique that is it should not have been used. I have been trying for it but to no avail. Here is what iam doing:

int nRand = 0;
int n = 0;
boolean bFlag = true;
while (bFlag && n <= 80)
{
	//Generate a random no
	nRand = new Random().nextInt(81);
	
	if (...//Now check if the no has already been used)
	{
		...
		//perform some work

		bFlag = false;
	}
	//Increment n. When n > 80 it will show that all no have been used.
	++n;
}

The problem with the above code is that nextInt doesnt gen a unique no. For instance lets say nextInt gen 20 and 20 is already used then in all other iterations of the while loop nextInt continues to gen 20 , while i want it to generate a unique no (a no which has not been gen before).

Please help.

Regards.

[kaaj]

The following class generates random numbers within specified limits

public class RandomNumberBounds {

private static void generateRandomNumber() {

int rawNumber;

//change these two for ur limit
int min = 30;
int max = 256;

for (int i = 0; i < 500; i++) {
rawNumber = (int) (Math.random() * (max - min + 1) ) + min;
System.out.println("Random number : " + rawNumber);
}

System.out.println("\n");
}

public static void main(String[] args) {
generateRandomNumber();
}

}

Happy coding!!!!!!

[logan]

Thanks mate !