Example1

import java.lang.Math;

public class RandomNumberExample1

{

public static void main(String args[])

{

// Generating random numbers

System.out.println("1st Random Number: " + Math.random());

System.out.println("2nd Random Number: " + Math.random());

System.out.println("3rd Random Number: " + Math.random());

System.out.println("4th Random Number: " + Math.random());

}

}

Example2

public class RandomNumberExample2

{

public static void main( String args[] )

{

int min = 200;

int max = 400;

//Generate random double value from 200 to 400

System.out.println("Random value of type double between "+min+" to "+max+ ":");

double a = Math.random()*(max-min+1)+min;

System.out.println(a);

//Generate random int value from 200 to 400

System.out.println("Random value of type int between "+min+" to "+max+ ":");

int b = (int)(Math.random()*(max-min+1)+min);

System.out.println(b);

}

}

Exmple3

import java.util.Random;

public class RandomNumberExample3

{

public static void main(String args[])

{

// creating an object of Random class

Random random = new Random();

// Generates random integers 0 to 49

int x = random.nextInt(50);

// Generates random integers 0 to 999

int y = random.nextInt(1000);

// Prints random integer values

System.out.println("Randomly Generated Integers Values");

System.out.println(x);

System.out.println(y);

// Generates Random doubles values

double a = random.nextDouble();

double b = random.nextDouble();

// Prints random double values

System.out.println("Randomly Generated Double Values");

System.out.println(a);

System.out.println(b);

// Generates Random float values

float f=random.nextFloat();

float i=random.nextFloat();

// Prints random float values

System.out.println("Randomly Generated Float Values");

System.out.println(f);

System.out.println(i);

// Generates Random Long values

long p = random.nextLong();

long q = random.nextLong();

// Prints random long values

System.out.println("Randomly Generated Long Values");

System.out.println(p);

System.out.println(q);

// Generates Random boolean values

boolean m=random.nextBoolean();

boolean n=random.nextBoolean();

// Prints random boolean values

System.out.println("Randomly Generated Boolean Values");

System.out.println(m);

System.out.println(n);

}

}

Example4

import java.util.concurrent.ThreadLocalRandom;

public class RandomNumberExample4

{

public static void main(String args[])

{

// Generate random integers between 0 to 999

int a = ThreadLocalRandom.current().nextInt();

int b = ThreadLocalRandom.current().nextInt();

// Print random integer values

System.out.println("Randomly Generated Integer Values:");

System.out.println(a);

System.out.println(b);

// Generate Random double values

double c = ThreadLocalRandom.current().nextDouble();

double d = ThreadLocalRandom.current().nextDouble();

// Print random doubles

System.out.println("Randomly Generated Double Values:");

System.out.println(c);

System.out.println(d);

// Generate random boolean values

boolean e = ThreadLocalRandom.current().nextBoolean();

boolean f = ThreadLocalRandom.current().nextBoolean();

// Print random Booleans

System.out.println("Randomly Generated Boolean Values:");

System.out.println(e);

System.out.println(f);

}

}

Example5

import java.util.Random;

public class RandomNumberExample5

{

public static void main(String[] args)

{

randomInts(5);

randomInts(9, 50, 90);

//getStreamOfRandomInts(30, 50);

}

//method that generates a stream of integers having size 5

public static void randomInts(int num)

{

Random random = new Random();

random.ints(num).forEach(System.out::println);

}

//method that generates a stream of 9 integers between 50 to 90

public static void randomInts(int num, int origin, int bound)

{

Random random1 = new Random();

random1.ints(num, origin, bound).forEach(System.out::println);

}

}