how to add element to arraylist in java

/**
 * @author lautturi.com
 * Java example: add element in java arraylist 
 */

import java.util.*;

public class Lautturi {

	public static void main(String[] args) {
		
		ArrayList<Integer> arrlist = new ArrayList<Integer>(); 
		arrlist.add(1);
		arrlist.add(2);
		arrlist.add(3);
        System.out.println(arrlist);

	}
}

output:

[1, 2, 3]