Question

1. Using the ArrayList add() method, write the statement to insert “July” in the first position of the months ArrayList. Describe what would happen if the position number is invalid for the ArrayList.

2. Declare an ArrayList that declares a list of strings with a capacity of 20.

Answer 1

for adding the element in a position of the array list, if we give an invalid position number (which is greater than it's capacity or less than 0) then it will through an exception saying java.lang.IndexOutOfBoundException, and program terminates.

code:

import java.util.ArrayList;

class Main {

public static void main(String[] args) {

ArrayList months = new ArrayList<String>();

//inserting into the first position

months.add(0, "july");

System.out.println(months.get(0));

//declaring array list with capacity 20

ArrayList list = new ArrayList<String>(20);

}

}