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

public class Typo { 
    public static void main(String[] args){     
        String ver = "NOK";

        String text = "ababababbaba";

        if( (text.length() - text.replaceAll("a","").length() ) ==  
            ( text.length() - text.replaceAll("b","").length() ) ) {
            ver = "OK";     
        }

        System.out.println(ver);
    }
}