Convert Hashset To Array In Java

In this approach we will convert HashSet to array using hashset toArray() method . This is easiest approach . HashSet toarray() method returns an array containing all of the elements in this collection. We we will create HashSet and add element into it using add() method . Then we will use set.toArray() method on HashSet and it returns array of elements of HashSet .

import java.util.HashSet;

public class HashSetToArray {
	public static void main(String[] args) {
		  //Constructs a new, empty set
		   HashSet<String>	hashSet = new HashSet<String>();
		   
		   //add element in it 
		   hashSet.add("java");
		   hashSet.add("php");
		   hashSet.add("android");
		   
		   //display the element 
		   System.out.println("element in hashset ="+ hashSet);

		   /*
		    * Returns an array containing all 
		    * of the elements in this collection
		    */
		   Object[] array = hashSet.toArray();
		   
		   //print object type array
		   for (Object object : array) {
			System.out.println(object);
		  }

	}
}

Output:

element in hashset =[java, android, php]
java
android
php

2. Convert HashSet to array – Iterate HashSet

In this Approach we will iterate HashSet element and add them to array one by one as per given below java program.

import java.util.HashSet;

public class HashSetToArray3 {
	
	public static void main(String[] args) {
		   //Constructs a new, empty set
		   HashSet<String>	hashSet = new HashSet<String>();
		   
		   //add element in it 
		   hashSet.add("java");
		   hashSet.add("php");
		   hashSet.add("android");
		   
		   //display the element 
		   System.out.println("element in hashset ="+ hashSet);
		
		   String [] arr = new String[hashSet.size()];
		   
		   int i =0;
		   for (String element : hashSet) {
			arr[i++] = element;
		   }

		   //print array
		   for (String element : arr) {
			System.out.println(element);
		}

		   
	}

}

Output:

element in hashset =[java, android, php]
java
android
php

In this tutorial we have learned about how to convert HashSet to array in java . We have used two approaches in this example .

A Guide to HashSet                                                                                                            Java Doc -HashSet