Must be an array type but resolved to string

Question

I am getting the \"Must be an array type but it resolved to string\" error in my code. It also says that i (in the code below) cannot be resolved to a variable which I don\'

Answer 1

You using String incorrectly. Instead of accessing via [] use dna.charAt(i).

Altough logically a string is an array of characters in Java a String type is a class (which means it has attributes and methods) and not a typical array.

And if you want to compare a single character to another enclose it with '' instead of "":

if (dna.charAt(i) == 'c')
.
.