4 days ago - Java™ Platform Standard Ed. 8 ... An instance of this class is used to generate a stream of pseudorandom numbers. The class uses a 48-bit seed, which is modified using a linear congruential formula. (See Donald Knuth, The Art of Computer Programming, Volume 2, Section 3.2.1.) If two instances ...

commons.apache.org › proper › commons-lang › javadocs › api-3.9 › org › apache › commons › lang3 › RandomUtils.html

RandomUtils (Apache Commons Lang 3.9 API)

Utility library that supplements the standard Random class.

Videos

04:27

YouTube

Java random numbers 🎲 【4 minutes】 - YouTube

Generate random numbers using Java! 🔀 - YouTube

December 5, 2024

05:01

YouTube

JAVA || How to use the Random class WITH lower and upper bounds ...

January 20, 2022

09:45

YouTube

Generate Random Numbers using java.util.Random & java.util ...

How to Generate Random Numbers in Java - 5 Minute Java - YouTube

digitalocean.com › community › tutorials › random-number-generator-java

Random Number Generator in Java | DigitalOcean

August 4, 2022 - There are many ways to generate a random number in java. java.util.Random class can be used to create random numbers.

Medium

medium.com › @generativeai.saif › java-random-number-generator-5-methods-explained-with-examples-bf9e53abed3c

Java Random Number Generator: 5 Methods Explained with Examples | by Saif Ali | Medium

April 6, 2025 - It provides methods for generating various types of random values. import java.util.Random; public class RandomExample { public static void main(String[] args) { // Create an instance of Random Random random = new Random(); // Generate random ...

GeeksforGeeks

geeksforgeeks.org › java › java-util-random-class-java

Java.util.Random class in Java - GeeksforGeeks

July 23, 2025 - This class provides various method calls to generate different random data types such as float, double, int. Constructors: ... java.util.Random.doubles(): Returns an effectively unlimited stream of pseudo random double values, each between zero ...

Huda Tutorials

hudatutorials.com › java › util › random

java util Random Class - java.util.Random Class in Java

June 30, 2021 - The Java Random class is used to generate a stream of pseudorandom numbers. In other words Random class is used to generate random numbers in Java.

Oracle

docs.oracle.com › en › java › javase › 21 › docs › api › java.base › java › util › random › package-summary.html

java.util.random (Java SE 21 & JDK 21)

January 20, 2026 - There are also some more specialized ... of random number generators SplittableGenerator, JumpableGenerator, LeapableGenerator, and ArbitrarilyJumpableGenerator that have specific strategies for creating statistically independent instances. To get started, an application should first create one instance of a generator class. Assume that the contents of the package java.util.random has ...

Find elsewhere

Google Bing Mojeek

reddit.com › r/learnjava › how do i use java.util.random to generate random integers within a given interval?

r/learnjava on Reddit: How do I use java.util.Random to generate random integers within a given interval?

October 21, 2020 -

I am trying to generate a random number between 25 and 50, however every time I run my code, I keep getting 35. My teacher says it's because I planted a "seed" inside the Random declaration, but how would I change this into an interval?

import java.util.Random;

public class Range{

public static void main(String[] args) {

	`// TODO Auto-generated method stub`

Random rand = new Random(25);

int num = rand.nextInt(51);

System.out.println(num);

}

Top answer

1 of 2

Look at the javadocs for java.util.Random . What does passing an argument to the Random constructor do? It sets the seed for that instance. Well what does that mean? For pseudo-random generators like java.util.Random you must set an initial seed which it uses to generate values. Providing the same seed will generate the same values in the same order. In your code you've set the seed to 25, which explains why you always get the same value. Is there a way to construct an instance of java.util.Random without providing a seed?

2 of 2

Don't initialize the random generator with a fixed seed - doing it this way will always produce the same sequence of random numbers. So, you want your random number to be in a certain minimum and maximum, yet the random number generator always generates random numbers from 0 to some range? Can you think of very simple, basic mathematical operations that you could use to: determine the range (amount of whole numbers) between a given minimum and maximum? shift a certain range by an offset? These two questions will solve your problem. It is easier than you think.

Unizar

eolo.cps.unizar.es › java › jdk1.2 › jdk1.2.2-docs › api › java › util › class-use › Random.html

Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Uses of Class java.util.Random

Uses of Random in java.math · Constructors in java.math with parameters of type Random BigInteger.BigInteger(int numBits, Random rnd) Constructs a randomly generated BigInteger, uniformly distributed over the range 0 to (2numBits - 1), inclusive. BigInteger.BigInteger(int bitLength, int certainty, ...

Java Mex

javamex.com › tutorials › random_numbers › java_util_random.shtml

Using java.util.Random

A guide to the different methods on java.util.Random and other Java random number generation classes.

Spring

docs.spring.io › spring-ai › reference › api › chatclient.html

Chat Client API :: Spring AI Reference

ActorFilms actorFilms = chatClient.prompt() .advisors(AdvisorParams.ENABLE_NATIVE_STRUCTURED_OUTPUT) .user("Generate the filmography for a random actor.") .call() .entity(ActorFilms.class); The stream() method lets you get an asynchronous response as shown below: Flux<String> output = chatClient.prompt() .user("Tell me a joke") .stream() .content(); You can also stream the ChatResponse using the method Flux<ChatResponse> chatResponse(). In the future, we will offer a convenience method that will let you return a Java entity with the reactive stream() method.

CodeGym

codegym.cc › java blog › java classes › java.util.random class

Java.util.Random class

October 11, 2023 - The java.util.Random class is used to generate pseudorandom numbers. The methods implemented by this class are used to generate different random data types such as int, double, and float.

Baeldung

baeldung.com › home › java › java numbers › random number generators in java

Random Number Generators in Java | Baeldung

January 8, 2024 - The most commonly used random number generator is Random from the java.util package.

Oracle

docs.oracle.com › en › java › javase › 21 › docs › api › java.base › java › util › Random.html

Random (Java SE 21 & JDK 21)

January 20, 2026 - Java implementations must use all the algorithms shown here for the class Random, for the sake of absolute portability of Java code. However, subclasses of class Random are permitted to use other algorithms, so long as they adhere to the general contracts for all the methods. The algorithms implemented by class Random use a protected utility method that on each invocation can supply up to 32 pseudorandomly generated bits.

Stack Overflow

stackoverflow.com › questions › 5887709 › getting-random-numbers-in-java

Getting random numbers in Java - Stack Overflow

1. Using Math.random()

double random = Math.random() * 49 + 1;
or
int random = (int )(Math.random() * 50 + 1);

This will give you value from 1 to 50 in case of int or 1.0 (inclusive) to 50.0 (exclusive) in case of double

Why?

random() method returns a random number between 0.0 and 0.9..., you multiply it by 50, so upper limit becomes 0.0 to 49.999... when you add 1, it becomes 1.0 to 50.999..., now when you truncate to int, you get 1 to 50. (thanks to @rup in comments). leepoint's awesome write-up on both the approaches.

2. Using Random class in Java.

Random rand = new Random(); 
int value = rand.nextInt(50);

This will give value from 0 to 49.

For 1 to 50: rand.nextInt((max - min) + 1) + min;

Source of some Java Random awesomeness.

BrainKart

brainkart.com › article › Random---java-util_10583

Random - java.util

If you initialize a Random object with a seed, you define the starting point for the random sequence. If you use the same seed to initialize another Random object, you will extract the same random sequence. If you want to generate different sequences, specify different seed values.

Maven Repository

mvnrepository.com › artifact › org.apache.commons › commons-lang3

Maven Repository: org.apache.commons » commons-lang3

November 12, 2025 - Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang.

Sentry

sentry.io › sentry answers › java › generating random numbers in java

Generating random numbers in Java | Sentry

September 15, 2024 - For example, the following code returns a random number between -5 and 5: import java.util.Random; public class RandRange{ public static void main(String[] args){ int start = -5; int end = 5; Random rand = new Random(); int n = rand.nextInt(end - start) + start; System.out.println(n); } }

Classpath

developer.classpath.org › doc › java › util › Random-source.html

Source for java.util.Random (GNU Classpath 0.95 Documentation)

This returns 227: * an int value whose 32 bits are independent chosen random bits 228: * (0 and 1 are equally likely). The implementation for 229: * java.util.Random is: 230: * 231: <pre>public int nextInt() 232: { 233: return next(32); 234: }</pre> 235: * 236: * @return the next pseudorandom value 237: */ 238: public int nextInt() 239: { 240: return next(32); 241: } 242: 243: /** 244: * Generates the next pseudorandom number.

Coderanch

coderanch.com › t › 742933 › java › Generating-random-number-ways

Generating random number different ways (Features new in Java 8 forum at Coderanch)

Suhaas Parekh wrote: 1. Why is the 2nd one generating numbers greater than 10 although I have passed the seed as 10 to the constructor of Random? You have misunderstood the function of a seed. The seed has nothing to do with the upper limit of numbers the PRNG (Pseudo Random Number Generator) will produce.