Set toArray() Method in Java (original) (raw)

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