Java Array to Set - Java2Blog

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()
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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 this method.

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.

1. Using Java 8’s Stream

2. Using HashSet constructor()

3. Using Google Guava()

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