Check out example codes for "how to add element to arraylist". It will help you in understanding the concepts better.

Code Example 1

// Java code to illustrate add(Object o) 
import java.util.ArrayList; 
public class ArrayListDemo { 
public static void main(String[] args) 
        // create an empty array list with an initial capacity 
        ArrayList<Integer> arrlist = new ArrayList<Integer>(5); 
        // use add() method to add elements in the list 
        // prints all the elements available in list 
        for (Integer number : arrlist) { 
            System.out.println("Number = " + number); 

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