randy_ortan
Joined: 11 Sep 2008
Posts: 2
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 Posted: Mon Sep 22, 2008 7:49 am Post subject: How to Generate Unique Random Numbers? |
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| Code: |
import com.sun.crypto.provider.RSACipher;
import java.util.Random;
public class RandomRange {
static int START = 1;
static int END;
static Random random = new Random();
private static void showRandomInteger(int aStart, int aEnd, Random aRandom){
if ( aStart > aEnd ) {
throw new IllegalArgumentException("Start cannot exceed End.");
}
//get the range, casting to long to avoid overflow problems
long range = (long)aEnd - (long)aStart + 1;
// compute a fraction of the range, 0 <= frac < range
long fraction = (long)(range * aRandom.nextDouble());
int randomNumber = (int)(fraction + aStart);
// System.out.println("Hi this is from senthil == >"+ j );
log("Generated : " + randomNumber);
}
private static void log(String aMessage){
System.out.println(aMessage);
}
public static void main(String aArgs[]){
int countrec = 9;
log("Generating random integers in the range "+START+"...." + countrec);
END = countrec - 1;
for (int idx = START; idx <= 5; ++idx){
showRandomInteger(START, END, random);
}
log("Done.");
}
}
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