public class ArrayListOperations $\{$

public static void main$($String$[]$ args$)\{$

$//$ a$.$ Add and display the following elements in the ArrayList object: Google, Apple, Amazon, Facebook, Twitter, and Oracle.

ArrayList companies $=$ new ArrayList$<>()$;

companies.add$("$Google$")$;

companies.add$("$Apple$")$;

companies.add$("$Amazon$")$;

companies.add$("$Facebook$")$;

companies.add$("$Twitter$")$;

companies.add$("$Oracle$")$;

System.out.println$("$Initial list of companies:"$)$;

for $($String company : companies$)\{$

System.out.println$($company$)$;

$\}$

$//$ b$.$ Update the $3$rd element in the above list by $$Microsoft$.$

companies.set$(2,$ "Microsoft"$)$; $//$ Arrays are zero$-$indexed, so $3$rd element is at index $2$

System.out.println$("$

List after updating the $3$rd element to 'Microsoft':"$)$;

for $($String company : companies$)\{$

System.out.println$($company$)$;

$\}$

$//$ c$.$ Remove the last element from the list of objects.

companies.remove$($companies$.$size$()-1)$;

System.out.println$("$

List after removing the last element:"$)$;

for $($String company : companies$)\{$

System.out.println$($company$)$;

$\}$

$//$ d$.$ Check whether an element is available on the list.

String elementToCheck $=$ "Facebook";

boolean isAvailable $=$ companies.contains$($elementToCheck$)$;

System.out.println$("$

Is $\text{'}"+$ elementToCheck $+"\text{'}$ available in the list? $"+$ isAvailable$)$;

$\}$

$\}$