How to convert array to Set/HashSet

import java.util.Arrays;
import java.util.HashSet;

public class ArrayToSet {
	
	public static void main(String[] args) {
    	String [] arr = {"java","php","android","angularjs","spring"}; 
    	
    	//Constructs a new set containing the elements
    	//in the specified collection
    	HashSet<String> hashSet = new HashSet<>( Arrays.asList( arr ));
    	
    	//print hashset
    	System.out.println("hashset is ="+ hashSet);
    	
	}

}

hashset is =[spring, java, android, php, angularjs]

2. Using Collections.AddAll() Method

Here , We will learn java program of convert array to set with help of collections.AddAll() method.

• Create an array to be convert
• Create an empty HashSet
• Add the element of array to hashset by passing  array and hashset as argument in collections.AddAll() method .

import java.util.Collections;
import java.util.HashSet;

public class ArrayToSet2 {
	
	public static void main(String[] args) {
		
    	String [] arr = {"java","php","android","angularjs","spring"}; 
    	
    	//Constructs a new set containing the 
    	//elements in the specified collection
    	HashSet<String> hashSet = new HashSet<String>();
		
    	//Adds all of the specified elements
    	//to the specified collection
    	Collections.addAll(hashSet, arr);
    	
    	//print hashset
    	System.out.println("hashset is ="+ hashSet);
    	
	}

}

Output:

hashset is =[spring, java, android, php, angularjs]

3. Using Add() Method

In this method we will convert array to set by iterating element of array and one by one add to hashset using add() method .

import java.util.HashSet;

public class ArrayToSet2 {
	
	public static void main(String[] args) {
		
    	String [] arr = {"java","php","android","angularjs","spring"}; 
    	
    	//Constructs a new set containing the 
    	//elements in the specified collection
    	HashSet<String> hashSet = new HashSet<String>();
		
    	for (String element : arr) {
			hashSet.add(element);
		}
    	
    	//print hashset
    	System.out.println("hashset is ="+ hashSet);
    	
	}

}

Output :

hashset is =[spring, java, android, php, angularjs]

In this tutorial we have learn java program how to convert array to set in java. You can learn also how to convert HashSet to array

Reference :

A Guide To HashSet                                                                                                          Java Doc – Hashset