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Kalpana WankhedeKalpana Wankhede 

Hello, Difference between one dimensional and two dimensional list?

Best Answer chosen by Kalpana Wankhede
AnkaiahAnkaiah (Salesforce Developers) 
Hi Kalpana,

A one-dimensional array stores a single list of various elements having a similar data type.
ex: List<String> Mnth = new List<String>();  

The two-dimensional array can be defined as an array of arrays. or a list of various lists, or an array of various one-dimensional arrays. It represents multiple data items in the form of a list.

ex: List<List<String>> Mnth = new List<Iist<String>>();  

If this helps, Please mark it as best answer.

Thanks!!

All Answers

AnkaiahAnkaiah (Salesforce Developers) 
Hi Kalpana,

A one-dimensional array stores a single list of various elements having a similar data type.
ex: List<String> Mnth = new List<String>();  

The two-dimensional array can be defined as an array of arrays. or a list of various lists, or an array of various one-dimensional arrays. It represents multiple data items in the form of a list.

ex: List<List<String>> Mnth = new List<Iist<String>>();  

If this helps, Please mark it as best answer.

Thanks!!
This was selected as the best answer
mukesh guptamukesh gupta
Hi Kalpana,

One-Dimensional Lists - Is when items in the list are linear and you could access them with one index only.
Example - List<Integer> listint = new List<Integer>{0, 1, 2, 3 };

You could access item like
Integer i = listint.get(0); // which returns integer from 0th index 
here i will be 0

Two-Dimensional Lists - Is when items in the list are linear and you could access them with more then one index.
Example - List<List<Integer>> listOdListInt = new List<Integer> { {0, 1, 2, 3}, {3, 2, 1, 0}, {3, 5, 6, 1}, {3, 8, 3, 4} };

Integer i = listint.get(1).get(0); // which returns integer from 0th index of 1st index list 
here i will be 3

if you need any assistanse, Please let me know!!

Kindly mark my solution as the best answer if it helps you.

Thanks
Mukesh 
 
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