Convert Wrapper value array list into primitive array in Java

import java.util.ArrayList;
public class Demo {
	public static void main(String[] args) {
		ArrayList<Integer>arrList = new ArrayList<Integer>();
		arrList.add(5);
		arrList.add(10);
		arrList.add(15);
		arrList.add(20);
		arrList.add(25);
		arrList.add(30);
		arrList.add(45);
		arrList.add(50);
		final double[] arr = new double[arrList.size()];
		int index = 0;
		for (final Integer value: arrList) {
			arr[index++] = value;
		}
		System.out.println("Elements of double array...");
		for (Double i: arr) {
			System.out.println(i);
		}
	}
}