Set toArray() Method in Java

Set toArray() Method in Java

Last Updated : 06 Feb, 2025

In Java, the toArray() method is used to convert a collection to an array. It returns an array containing all the elements in the collection in the correct order.

Example 1: Converting a Set to an Array

This is an example where a Set of String elements is converted into an array using the toArray() method. The method returns an Object[] array.

Java

// Java Program to demonstrates the working toArray()
import java.util.*;

public class Geeks {
    public static void main(String args[]) {
        
        // Creating a Set of Strings
        Set<String> s = new HashSet<String>();

        // Adding elements to the Set
        s.add("Java");
        s.add("C++");
        s.add("C");

        System.out.println("The Set: " + s);

        // Converting the Set to an Object array
        Object[] arr = s.toArray();

        System.out.println("The Array is:");
        for (Object obj : arr) {
            System.out.print(obj + " ");
        }
    }
}

Output

The Set: [Java, C++, C]
The Array is:
Java C++ C

Syntax of toArray() Method

Object[] toArray();

Parameter: This method does not take any parameter
Return Type: This method returns an array of type object which contains all the elements of the collection in the correct order.

Example 2: Converting a Set of Integers to a Specific Type Array

In this example, we use the toArray(T[] a) method, which allows us to specify the type of the array to be returned. This avoids the need for casting when using the array.

Java

// Converting set to an integer array
import java.util.*;

public class Geeks {
    public static void main(String args[]) {
        
        // Creating a Set of Integers
        Set<Integer> s = new HashSet<Integer>();

        // Adding elements to the Set
        s.add(10);
        s.add(15);
        s.add(30);
        s.add(20);
        s.add(5);
        s.add(25);

        System.out.println("The Set: " + s);

        // Converting the Set to an Integer array
        Integer[] arr = s.toArray(new Integer[0]);

        System.out.println("The Array is:");
        for (Integer num : arr) {
            System.out.println(num);
        }
    }
}

Output

The Set: [20, 5, 25, 10, 30, 15]
The Array is:
20
5
25
10
30
15

Set toArray() Method in Java

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