Java Random numbers

Use
Import java.util.Random;


1)To fetch a random number from 0 to that number

Random().nextInt(int bound) generates a random integer from 0 (inclusive) to bound (exclusive).

2)To fetch a random number in a Range

private static int getRandomNumberInRange(int min, int max) {
 Random r = new Random();
 return r.nextInt((max - min) + 1) + min;
}

3)To fetch Random objects from an array
String []guess={"Red","Blue","Green"};
char[] randomguess=guess[random.nextInt(guess.length)].toCharArray();


Source : https://www.mkyong.com/java/java-generate-random-integers-in-a-range/