Java LinkedHashSet newLinkedHashSet() Method (Introduced in Java 21)

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In Java 21, a new static factory method newLinkedHashSet() was introduced in the LinkedHashSet class. This method provides a convenient way to create an empty LinkedHashSet. This guide will cover the method's usage, explain how it works, and provide examples to demonstrate its functionality.

Table of Contents

1. Introduction
2. newLinkedHashSet Method Syntax
3. Examples
   • Creating an Empty LinkedHashSet
   • Adding Elements to the Created LinkedHashSet
4. Real-World Use Case
   • Use Case: Initializing a Set of Unique Tasks
5. Conclusion

Introduction

The LinkedHashSet.newLinkedHashSet() method is a new addition in Java 21 that provides a convenient way to create an empty LinkedHashSet. This method helps to improve code readability and conciseness when initializing an empty LinkedHashSet.

newLinkedHashSet() Method Syntax

The syntax for the newLinkedHashSet method is as follows:

public static <E> LinkedHashSet<E> newLinkedHashSet()

• The method does not take any parameters.
• The method returns a new, empty LinkedHashSet instance.

Examples

Creating an Empty LinkedHashSet

The newLinkedHashSet method can be used to create an empty LinkedHashSet.

Example

import java.util.LinkedHashSet;

public class NewLinkedHashSetExample {
    public static void main(String[] args) {
        // Creating an empty LinkedHashSet using the newLinkedHashSet method
        LinkedHashSet<String> animals = LinkedHashSet.newLinkedHashSet();

        // Printing the empty LinkedHashSet
        System.out.println("Empty LinkedHashSet: " + animals);
    }
}

Output:

Empty LinkedHashSet: []

Adding Elements to the Created LinkedHashSet

You can add elements to the LinkedHashSet created with the newLinkedHashSet method just like any other LinkedHashSet.

Example

import java.util.LinkedHashSet;

public class AddElementsExample {
    public static void main(String[] args) {
        // Creating an empty LinkedHashSet using the newLinkedHashSet method
        LinkedHashSet<String> animals = LinkedHashSet.newLinkedHashSet();

        // Adding elements to the LinkedHashSet
        animals.add("Lion");
        animals.add("Tiger");
        animals.add("Elephant");

        // Printing the LinkedHashSet with added elements
        System.out.println("LinkedHashSet: " + animals);
    }
}

Output:

LinkedHashSet: [Lion, Tiger, Elephant]

Real-World Use Case

Use Case: Initializing a Set of Unique Tasks

In a task management system, you might need to initialize a set of unique tasks. The newLinkedHashSet method can be used to create an empty set to store these tasks.

Example

import java.util.LinkedHashSet;

public class TaskManagementSystem {
    public static void main(String[] args) {
        // Creating an empty LinkedHashSet to store unique tasks
        LinkedHashSet<String> tasks = LinkedHashSet.newLinkedHashSet();

        // Adding tasks to the LinkedHashSet
        tasks.add("Complete project report");
        tasks.add("Email client updates");
        tasks.add("Prepare presentation");

        // Printing the tasks
        System.out.println("Tasks: " + tasks);
    }
}

Output:

Tasks: [Complete project report, Email client updates, Prepare presentation]

Conclusion

The LinkedHashSet.newLinkedHashSet() method introduced in Java 21 provides a convenient way to create an empty LinkedHashSet. By understanding how to use this method, you can improve code readability and conciseness when initializing empty sets. This method is useful for creating collections in a clean and efficient manner, making it a valuable tool for collection management in your Java applications. The real-world use case of initializing a set of unique tasks illustrates the practical application of this method.