Java LinkedHashSet parallelStream() Method

The LinkedHashSet.parallelStream() method in Java is used to create a parallel stream over the elements in a LinkedHashSet. 

Table of Contents

1. Introduction
2. parallelStream Method Syntax
3. Examples
   • Creating a Parallel Stream from a LinkedHashSet
   • Processing Elements in Parallel
4. Conclusion

Introduction

The LinkedHashSet.parallelStream() method is a member of the LinkedHashSet class in Java. It allows you to create a parallel stream over the elements in the LinkedHashSet, enabling parallel processing of the elements.

parallelStream() Method Syntax

The syntax for the parallelStream method is as follows:

public Stream<E> parallelStream()

• The method does not take any parameters.
• The method returns a Stream over the elements in the LinkedHashSet, which can be processed in parallel.

Examples

Creating a Parallel Stream from a LinkedHashSet

The parallelStream method can be used to create a parallel stream from a LinkedHashSet.

Example

import java.util.LinkedHashSet;
import java.util.stream.Stream;

public class ParallelStreamExample {
    public static void main(String[] args) {
        // Creating a LinkedHashSet of Strings
        LinkedHashSet<String> animals = new LinkedHashSet<>();

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

        // Creating a parallel stream from the LinkedHashSet
        Stream<String> parallelStream = animals.parallelStream();

        // Printing the elements of the parallel stream
        parallelStream.forEach(animal -> System.out.println("Animal: " + animal));
    }
}

Output (order may vary due to parallel processing):

Animal: Lion
Animal: Tiger
Animal: Elephant

Processing Elements in Parallel

Parallel streams can be used to process elements in parallel, which can improve performance for certain operations.

Example

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

public class ParallelProcessingExample {
    public static void main(String[] args) {
        // Creating a LinkedHashSet of Strings
        LinkedHashSet<String> animals = new LinkedHashSet<>();

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

        // Creating a parallel stream from the LinkedHashSet
        Stream<String> parallelStream = animals.parallelStream();

        // Collecting the elements in uppercase in parallel
        LinkedHashSet<String> upperCaseAnimals = parallelStream
            .map(String::toUpperCase)
            .collect(Collectors.toCollection(LinkedHashSet::new));

        // Printing the elements of the upperCaseAnimals LinkedHashSet
        upperCaseAnimals.forEach(animal -> System.out.println("Animal: " + animal));
    }
}

Output (order may vary due to parallel processing):

Animal: LION
Animal: TIGER
Animal: ELEPHANT
Animal: GIRAFFE
Animal: ZEBRA

Conclusion

The LinkedHashSet.parallelStream() method in Java provides a way to create a parallel stream over the elements in a LinkedHashSet. By understanding how to use this method, you can leverage parallel processing to improve the performance of certain operations. This method is useful for processing collections in parallel, making it a valuable tool for managing large datasets and performing complex operations in your Java applications.