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    A HashSet in Java is a collection that stores unique elements and does not maintain any order. Below is an example of initializing a HashSet with values.

    Example: Basic Initialization

    import java.util.HashSet;
    import java.util.Set;

    public class Main {
    public static void main(String[] args) {
    Set<String> serviceKeySet = new HashSet<>();
    serviceKeySet.add("Key1");
    serviceKeySet.add("Key2");
    serviceKeySet.add("Key3");

    System.out.println(serviceKeySet); // Output: [Key1, Key2, Key3]
    }
    }
    Cóipeáilte!

    Alternative Initialization Methods

    • Using Constructor with Arrays.asList:

    import java.util.Arrays;
    import java.util.HashSet;
    import java.util.Set;

    public class Main {
    public static void main(String[] args) {
    Set<String> serviceKeySet = new HashSet<>(Arrays.asList("Key1", "Key2", "Key3"));
    System.out.println(serviceKeySet); // Output: [Key1, Key2, Key3]
    }
    }
    Cóipeáilte!

    • Using Double Brace Initialization:

    Set<String> serviceKeySet = new HashSet<>() {{
    add("Key1");
    add("Key2");
    add("Key3");
    }};
    Cóipeáilte!

    • Using Java 8 Streams:

    import java.util.Set;
    import java.util.stream.Collectors;
    import java.util.stream.Stream;

    public class Main {
    public static void main(String[] args) {
    Set<String> serviceKeySet = Stream.of("Key1", "Key2", "Key3")
    .collect(Collectors.toCollection(HashSet::new));
    System.out.println(serviceKeySet); // Output: [Key1, Key2, Key3]
    }
    }
    Cóipeáilte!
    Why should Java developers understand HashSet initialization patterns?
    By understanding HashSet initialization patterns, performance considerations, and best practices, Java developers can create more robust and efficient code. This tutorial has provided insights into solving initialization problems, demonstrating how strategic approaches can enhance collection management and overall application performance.
    labex.io
    Baeldung
    https://www.baeldung.com › java-initialize-hashsetAistrigh an toradh seo

    Initializing HashSet at the Time of Construction - Baeldung

  1. Stack Overflow
    https://stackoverflow.com › questionsAistrigh an toradh seo

    java - How to initialize HashSet values by construction ... - Stack ...

    11 Ean 2010 · Eclipse Collections has containers for both object and primitive types, so I illustrated how you could use a Set<String> or CharSet in addition to mutable, immutable, …

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  2. GeeksForGeeks
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    How to Initialize HashSet Values Using Constructor in Java?

    23 Iúil 2025 · By using the constructor along with Arrays.asList () method we can initialize HashSet values. Below is the syntax of this for a clear understanding of the concept.

  3. codingtechroom.com
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  4. javaspring.net
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  5. matheusmello.io
    https://www.matheusmello.io › posts › java-how-to...Aistrigh an toradh seo

    How to initialize HashSet values by construction? - MatheusMello.io

    2 MFómh 2023 · Fortunately, Java provides us with a convenient way to tackle this issue using constructor initialization. Instead of manually adding each element, you can initialize the …

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  7. LabEx
    https://labex.io › tutorialsAistrigh an toradh seo

    How to solve HashSet initialization problems - LabEx

    Explore efficient Java HashSet initialization techniques, performance optimization strategies, and best practices for solving common initialization challenges in Java collections.

  8. Baeldung
    https://www.baeldung.com › java-string-initializationAistrigh an toradh seo

    String Initialization in Java - Baeldung

    8 Ean 2024 · Java String is one of the most important classes and we’ve already covered a lot of its aspects in our String -related series of tutorials. In this tutorial, we’ll focus on String …

  9. codingtechroom.com
    https://codingtechroom.com › question › initialize...Aistrigh an toradh seo

    How to Initialize a HashSet with Initial Values in Java?

    Learn how to efficiently initialize a HashSet in Java with initial values in a single line of code for better performance and cleaner syntax.

  10. javaspring.net
    https://www.javaspring.net › blog › initialize-a-string-in-javaAistrigh an toradh seo

    Initializing Strings in Java: A Comprehensive Guide

    12 Samh 2025 · This blog post will explore the various ways to initialize strings in Java, their usage methods, common practices, and best practices. By the end of this post, you will have a …

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