How to convert ArrayList to Array in Java?

By Preeti Jain Last updated : February 05, 2024

Problem statement

Given an ArrayList, write a Java program to convert the given ArrayList to an Array.

Converting ArrayList to Array in Java

To convert an ArrayList to an Array, you can use toArray() method.

toArray() Method

toArray() method is available in java.util package.
toArray() method is used to return a converted Array object which contains all of the elements in the ArrayList.
toArray() method does not throw any exception at the time of conversion from ArrayList to Array.
It's not a static method, it is accessible with class objects (i.e. If we try to execute with the class name then we will get an error).
It's not a final method, it is overridable in child class if we want.

Syntax

public Object[] toArray(){
}

Parameter(s)

It does not accept any parameter.

Return value

The return type of this method is Object[], it returns a converted ArrayList to an Array which contains all of the elements in the ArrayList.

Java program to convert ArrayList to Array

// Java program to demonstrate the example of
// conversion of an ArrayList to an Array with 
// the help of toArray() method of ArrayList

import java.util.*;

public class ArrayListToArray {
    public static void main(String[] args) {
        // ArrayList Declaration
        ArrayList arr_list = new ArrayList();

        // By using add() method to add few elements in 
        // ArrayList

        arr_list.add(10);
        arr_list.add(20);
        arr_list.add(30);
        arr_list.add(40);
        arr_list.add(50);

        // Display ArrayList
        System.out.println("ArrayList elements:");
        System.out.println(arr_list);

        System.out.println();

        // By using toArray() method is used to convert 
        // ArrayList to Array

        Object[] arr = arr_list.toArray();

        // Display Array
        System.out.println("Array elements: ");

        for (Object o: arr)
            System.out.println(o);
    }
}

Output

The output of the above program is:

ArrayList elements:
[10, 20, 30, 40, 50]

Array elements: 
10
20
30
40
50

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