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Java 8 – Convert Stream to LinkedHashSet

February 2, 2022 SJ Collection, Java 8 0

In this article, we will discuss how to convert Stream into a LinkedHashSet in Java 1.8 version using Stream API. LinkedHashSet doesn’t allow duplicates but maintains insertion-order.

Stream to LinkedHashSet :

  1. Using Collectors.toSet()
  2. Using Collectors.toCollection()

1. Using Collectors.toSet()

  • First, convert Stream to Set using collect() method of Stream API by passing Collectors.toSet() as input argument
  • Above conversion yields Set and not LinkedHashSet
  • For Set to LinkedHashSet conversion, create LinkedHashSet object and pass above set as constructor-argument
  • Finally, print converted LinkedHashSet elements to console

StreamToLinkedHashSetUsingCollectorsToSet.java

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package net.bench.resources.stream.to.list;
 
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
 
public class StreamToLinkedHashSetUsingCollectorsToSet {
 
    public static void main(String[] args) {
 
        // 1. Stream of String tokens
        Stream<String> nameStream = Stream.of(
                "Rajiv",
                "Anbu",
                "Santosh",
                "Abdul",
                "Lingaraj"
                );
 
 
        // 2. convert Stream<String> to Set<String>
        Set<String> names = nameStream.collect(Collectors.toSet());
 
 
        // 3. Set<String> to LinkedHashSet<String>
        LinkedHashSet<String> lhSetNames = new LinkedHashSet<String>(names);
 
 
        // 4. print to console
        System.out.println("Stream to LinkedHashSet : \n\n" + lhSetNames);
    }
}

Output:

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Stream to LinkedHashSet :
 
[Lingaraj, Abdul, Rajiv, Anbu, Santosh]

2. Using Collectors.toCollection()

  • Convert Stream to LinkedHashSet using collect() method of Stream API by passing Collectors.toCollection(LinkedHashSet::new) as input argument directly
  • Print converted LinkedHashSet elements to console

StreamToLinkedHashSetUsingCollectorsToCollection.java

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package net.bench.resources.stream.to.list;
 
import java.util.LinkedHashSet;
import java.util.stream.Collectors;
import java.util.stream.Stream;
 
public class StreamToLinkedHashSetUsingCollectorsToCollection {
 
    public static void main(String[] args) {
 
        // 1. Stream of String tokens
        Stream<String> nameStream = Stream.of(
                "Rajiv",
                "Anbu",
                "Santosh",
                "Abdul",
                "Lingaraj"
                );
 
 
        // 2. convert Stream<String> to LinkedHashSet<String>
        LinkedHashSet<String> lhSetNames = nameStream
                .collect(Collectors.toCollection(LinkedHashSet::new));
 
 
        // 3. print to console
        System.out.println("Stream to LinkedHashSet : \n\n" + lhSetNames);
    }
}

Output:

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Stream to LinkedHashSet :
 
[Rajiv, Anbu, Santosh, Abdul, Lingaraj]

Related Articles:

References:

Happy Coding !!
Happy Learning !!

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Java 8 - Convert Stream to HashSet

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