AVAJAVA Web Tutorials

The RandomInt class shows how to generate a random int using the nextInt() method of a Random object. It also shows how to generate a random int in a particular range of numbers via nextInt(int n).

RandomInt.java

package test;

import java.util.Random;

public class RandomInt {

	public static void main(String[] args) {

		Random random = new Random();

		// generates a random int
		for (int i = 0; i < 10; i++) {
			anyRandomInt(random);
		}

		System.out.println();

		// generates a random int in a range from low int to high int
		for (int i = 0; i < 10; i++) {
			anyRandomIntRange(random, 1, 5);
		}
	}

	public static void anyRandomInt(Random random) {
		int randomInt = random.nextInt();
		System.out.println("random integer:" + randomInt);
	}

	public static void anyRandomIntRange(Random random, int low, int high) {
		int randomInt = random.nextInt(high) + low;
		System.out.println("random integer from " + low + " to " + high + ":" + randomInt);
	}

}

The output of executing the RandomInt class is shown here:

random integer:-825420979
random integer:-1025830639
random integer:1004593785
random integer:1171042605
random integer:780283973
random integer:-450373878
random integer:-636417266
random integer:1017801497
random integer:1000679011
random integer:2147196241

random integer from 1 to 5:2
random integer from 1 to 5:5
random integer from 1 to 5:2
random integer from 1 to 5:2
random integer from 1 to 5:4
random integer from 1 to 5:5
random integer from 1 to 5:1
random integer from 1 to 5:3
random integer from 1 to 5:5
random integer from 1 to 5:3

It should be noted that the int value that is returned from nextInt() and nextInt(int n) is a pseudorandom, uniformly distributed int value.