What happens when the following elements get inserted in an ArrayList?

Sandeep Soni

8.1k

al.Add(1);
al.Add('1');
al.Add("1");

a) Compilation Error
b) Code works perfectly - Prints 1 ‘1’ “1” if an Console.Write statement is written.
c) System.IndexOutOfRangeException
d) System.InvalidCastException
e) System.StackOverflowException
f) System.IO.IOException

Unlike arrays, Arraylist can have objects of different types. So it will work. b.

Tushar Dikshit

I used foreach and print every elements with the tostring method, there is no exception and displayed 1 1 1

Kenny Dong

b) Since ArrayList is not generically typed it should work perfectly

Alan Moore

ArrayList is a non-generic collection class. ArrayList can be used to add unknown data i.e. when we do not know the types of data and size of the data.
So Code works perfectly - Prints 1 ‘1’ “1” if an Console.Write statement is written.

Ashish Gangwar

it will print if it loop trough 1 1 1

Jignesh Kumar

Since ArrayList is class belongs to Collection, it will hold the heterogeneous types of data. So No problem will occur and all the values will get stored into ArrayList.

Mangesh Kanche