arraylist to int array conversion in java

/**
 * @author lautturi.com
 * Java example: arraylist to int array conversion
 */

import java.util.*;
import java.time.*;

public class Lautturi {
	public static void main(String[] args) {
			
			ArrayList<Integer> arraylist = new ArrayList<Integer>();
			arraylist.add(1);
			arraylist.add(2);
			arraylist.add(3);
			
			int size = arraylist.size();
			int[] arr = new int[size];
			arr = arraylist.stream().mapToInt(i -> i).toArray();
		    System.out.println(Arrays.toString(arr));
	}
}

output:

[1, 2, 3]