Java Array to Set

In this post, we will learn java array to set conversion.

Table of Contents

1. Using Java 8’s Stream
2. Using HashSet constructor()
3. Using Google Guava()

There are many ways to convert array to set.

1. Using Java 8’s Stream

If you are using Java 8, I would recommend using Java 8 Stream.

package org.arpit.java2blog;

import java.util.Arrays;

import java.util.Set;

import java.util.stream.Collectors;

public class ArrayToSetMain {

public static void main(String[] args) {

String s[]= {"John","Martin","Mary","John","Martin"};

Set<String> set = Arrays.stream(s).collect(Collectors.toSet());

System.out.println(set);

}

Output

[John, Martin, Mary]

2. Using HashSet constructor()

We can directly call HashSet‘s constructor for java set to array conversion.

package org.arpit.java2blog;

import java.util.Arrays;

import java.util.HashSet;

import java.util.Set;

public class ArrayToSetMain {

public static void main(String[] args) {

String s[]= {"John","Martin","Mary","John","Martin"};

Set<String> set = new HashSet<>(Arrays.asList(s));;

System.out.println(set);

}

Output

[John, Martin, Mary]

3. Using Google Guava()

We can use google guava library to do Array to Set conversion using Sets’s newHashSet method.

package org.arpit.java2blog;

import java.util.Arrays;

import java.util.HashSet;

import java.util.Set;

import org.apache.commons.compress.utils.Sets;

public class ArrayToSetMain {

public static void main(String[] args) {

String s[]= {"John","Martin","Mary","John","Martin"};

Set<String> set = Sets.newHashSet(s);

System.out.println(set);

}

Output

[John, Martin, Mary]

That’s all about Java Array to set conversion.

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1. Using Java 8’s Stream

2. Using HashSet constructor()

3. Using Google Guava()

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