Why this merge sort isnt working? Whats the problem? please state the changes

Question

https://code.sololearn.com/cz99BbOtaii0/?ref=app

Answer 1

mergeArray()
...
int i = li;
// int j = middle + i;
int j = middle + 1; // +number one, not +variable i

Answer 2

But sir
I want to sort list without using these:-
java.util.Arrays; & java.util.ArrayList;
Understanding the concepts of different types of sorting algorithms

Answer 3

Thanks zemiak sir😢

Answer 4

I advise you to do first
import java.util.Arrays;

Then do Arrays.sort();
Easy, doesn't you?