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HashSet toArray() method in Java with Example

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  • Last Updated : 24 Dec, 2018
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The toArray() method of Java HashSet is used to form an array of the same elements as that of the HashSet. Basically, it copies all the element from a HashSet to a new array.

Syntax:

Object[] arr = HashSet.toArray()

Parameters: The method does not take any parameters.

Return Value: The method returns an array containing the elements similar to the HashSet.

Below programs illustrate the HashSet.toArray() method:

Program 1:




// Java code to illustrate toArray()
  
import java.util.*;
  
public class HashSetDemo {
    public static void main(String args[])
    {
        // Creating an empty HashSet
        HashSet<String>
            abs_col = new HashSet<String>();
  
        // Use add() method to add
        // elements into the HashSet
        abs_col.add("Welcome");
        abs_col.add("To");
        abs_col.add("Geeks");
        abs_col.add("For");
        abs_col.add("Geeks");
  
        // Displaying the HashSet
        System.out.println("The HashSet: "
                           + abs_col);
  
        // Creating the array and using toArray()
        Object[] arr = abs_col.toArray();
  
        System.out.println("The array is:");
        for (int j = 0; j < arr.length; j++)
            System.out.println(arr[j]);
    }
}

Output:

The HashSet: [Geeks, For, Welcome, To]
The array is:
Geeks
For
Welcome
To

Program 2:




// Java code to illustrate toArray()
  
import java.util.*;
  
public class HashSetDemo {
    public static void main(String args[])
    {
        // Creating an empty HashSet
        HashSet<Integer>
            abs_col = new HashSet<Integer>();
  
        // Use add() method to add
        // elements into the HashSet
        abs_col.add(10);
        abs_col.add(15);
        abs_col.add(30);
        abs_col.add(20);
        abs_col.add(5);
        abs_col.add(25);
  
        // Displaying the HashSet
        System.out.println("The HashSet: "
                           + abs_col);
  
        // Creating the array and using toArray()
        Object[] arr = abs_col.toArray();
  
        System.out.println("The array is:");
        for (int j = 0; j < arr.length; j++)
            System.out.println(arr[j]);
    }
}

Output:

The HashSet: [20, 5, 25, 10, 30, 15]
The array is:
20
5
25
10
30
15

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