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  1. 123

    To generate a random 3-digit string in Java, you can use the Random class or ThreadLocalRandom for simplicity. Here's an example:

    import java.util.Random;

    public class RandomStringGenerator {
    public static void main(String[] args) {
    Random random = new Random();
    StringBuilder randomString = new StringBuilder();

    for (int i = 0; i < 3; i++) {
    char randomChar = (char) ('0' + random.nextInt(10)); // Generate a digit between '0' and '9'
    randomString.append(randomChar);
    }

    System.out.println("Random 3-digit string: " + randomString.toString());
    }
    }
    Copied!

    Explanation:

    1. Random Class: The Random class generates random integers.

    2. Character Conversion: Each digit is converted to its corresponding character using '0' + random.nextInt(10).

    Alternative Using Java 8 Streams:

    You can also use Java 8's ints() method for a more concise approach:

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  2. Baeldung
    https://www.baeldung.com › java-random-string

    Java – Generate Random String - Baeldung

    In this tutorial, we’re going to learn how to generate a random string in Java, first using the standard Java libraries, then using a Java 8 variant, and finally using the Apache C…
    Generate Random Unbounded String with Plain Java

    Let’s start simple and generate a random Stringbounded to 7 characters: Keep in mind that the new string will not be anything remotely alphanumeric.

    Generate Random Bounded String with Plain Java

    Next let’s look at creating a more constrained random string; we’re going to generate a random Stringusing lowercase alphabetic letters and a set length:

    Generate Random Alphanumeric String with Java 8

    Then we can widen our character set in order to get an alphanumeric String: We used the filtermethod above to leave out Unicode characters between 65 and 90 in order to avoid out of range characters.

    Generate Bounded Random String with Apache Commons Lang

    The Commons Lang library from Apache helps a lot with random string generation. Let’s take a look at generating a bounded String using only letters: So instead of all the low-level code in the Java example, this one is done with a simple one-liner.

  3. javaspring.net
    https://www.javaspring.net › blog › get-random-string-java

    Generating Random Strings in Java — javaspring.net

    Jan 16, 2026 · Java provides several ways to create random strings, each with its own characteristics and use cases. This blog post will explore the fundamental concepts, usage methods, common …

  4. Stack Overflow
    https://stackoverflow.com › questions

    How to generate a random String in Java - Stack Overflow

    May 19, 2010 · @chandra: Yes, exactly. Give it a string of the characters you want to select from. So if you only wanted digits you'd pass in "0123456789". If you wanted only capital letters you'd pass in …

    • Reviews: 5

      Code sample

      final Random random = new Random(System.nanoTime());
      final int max = (int) Math.pow(10, maxLength);
      final int maxMin = (int) Math.pow(10, maxLength-1);
      int i = 0;
      boolean unique = false;...
    • CodeJava.net
      https://www.codejava.net › coding › generate-random...

      Generate Random Strings in Java Examples

      Jan 13, 2023 · So in this article, I’d love to share with you some ways and code examples which you can use to generate random strings in Java, that include …

    • codingtechroom.com
      https://codingtechroom.com › question › -randomizing-string-java

      How to Randomize a String in Java - CodingTechRoom

      Learn how to randomize a string in Java with step-by-step methods, code snippets, and common pitfalls to avoid.

    • GeeksForGeeks
      https://www.geeksforgeeks.org › java › generate-random...

      Generate random String of given size in Java - GeeksforGeeks

      Jul 11, 2025 · Method 1: Using Math.random () Here the function getAlphaNumericString (n) generates a random number of length a string. This number is an index of a Character and this Character is …

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    • Programiz
      https://www.programiz.com › ... › generate-random-string

      Java Program to Create random strings

      In this example, we will learn to generate a random string and an alphanumeric random string in Java.

    • sqlpey.com
      https://sqlpey.com › java › generate-random-strings-java

      Generate Random Strings in Java: Practical Approaches and …

      Jul 22, 2025 · Explore various Java methods for generating random strings, from simple alphanumeric sequences to cryptographically secure identifiers, and learn best practices for their application.

    • TutorialsPoint
      https://www.tutorialspoint.com › java-program-to-create-random-strings

      Create Random Strings in Java - Online Tutorials Library

      Learn how to create random strings in Java with this comprehensive guide, including examples and best practices.

    • Generate random
      https://generate-random.org › strings › java

      Generate Random Strings in Java | Code Example - Generate …

      Learn how to generate random strings in Java using SecureRandom class. Complete examples for alphanumeric and custom character string generation.

    • Deep dive into Convert a String to a Random String Java

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