Java : why can’t I use sort in array but only in arraylist in JAVA?

Question

why can’t I use sort in array but only in arraylist in JAVA?
https://code.sololearn.com/c9s1nxo44lYl/?ref=app

+
The above code fails to deal with huge integers. Pls do suggest some modifications .

Answer 1

Arrays.sort(arr) will sort your unsorted arr array

Answer 2

ArrayList and array are different data structures. Cause arraylist isn't array, it is a list with indexes.

Answer 3

~ swim ~ BigInteger was really helpful, thank you

Answer 4

I am not sure about this, but I thought that arrays are immutuable.

Answer 5

Another question guys,
Why does arraylists exists in java when array can do it all alone?

Answer 6

Array has fixed size, Arraylist has variable size.
Means... If you create an array of 5 integers, you can never increase it to 6 or 7... Neither you can decrease it..
But in arraylist, you can always increase the size on requirement

Answer 7

I think ArrayList are more flexible and interactive than arrays itself, for example when you used facebook the information that are displayed in your screen is through ArrayList.

Answer 8

Harin Mehta no, I think you are wrong here, check this out
int[] arr = new arr();
an array is defined which is not limited

Answer 9

Rafael Olivar your reference to facebook is a clean bouncer for me, but I appreciate your knowledge, Thank you

Answer 10

~ swim ~ Sorry but I need your help one last time,
Do I need to import some class or what because my code shows error on BigInteger part.
i suggest you chec out my code in the above post which i just edited, IFF posible.