Why use reverse, if we can traverse the array from the end?

Are you sure that it is the same code?
This should happens only if the 'nums' was a char[] not a String[];
In the case of the char[] you would need to use result[i] = Character.getNumericValue(nums[i])

This code only works here. I tried to execute it in, IntelliJ the result is "[I @ 1540e19d". Works if "return result[i]"