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

I believe this is what you want:

private static boolean check(String input) {
    int count = 0;
    for (int i = 0; i < input.length(); ++i) {
        if (input.charAt(i) == 'a') {
            count++;
        }
    }
    return count == input.length() >> 1; // count == input.length()/2
}