Generate Random Numbers in Java

package nilpointer.net;

import java.util.Random;

public class Demo {

	public static void main(String[] args) {

		Random random = new Random();
		int upperbound = 100;
		int value1 = random.nextInt(upperbound);
		double value2 = random.nextDouble();
		float value3 = random.nextFloat();
		System.out.println("Random integer value from 0 to " + (upperbound - 1) + ": " + value1);
		System.out.println("Random float value between 0.0 and 1.0: " + value2);
		System.out.println("Random double value between 0.0 and 1.0: " + value3);

	}

}

Output

Random integer value from 0 to 99: 92
Random float value between 0.0 and 1.0: 0.14932076024393326
Random double value between 0.0 and 1.0: 0.19386327