check number of a given character occurence in a String

Question

I want to write a simple class to process Strings (may be very long strings up to 1mil characters in it). String will basically consists of two characters \"a\" and \"b\" that

Answer 1

What's wrong with using something simple as this? Your idea of doing something as simple as this is an overkill, and would end up using more resources.

String s = "abbb";

int a = 0;
int b = 0;
for(int i = 0; i

a = 1; b = 3