Java LinkedHashSet parallelStream() Method

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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.