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public class Main {
    public static void main(String[] args) {
        StringBuffer searchstr = new StringBuffer("hello how are you. ");
        int length = searchstr.length();
        int count = 0;
        for (int i = 0; i < length; i++) {
            if (searchstr.charAt(i) != 'h')
                continue;
            count++;
            searchstr.setCharAt(i, 'h');
        }
        System.out.println("Found " + count 
        + " 'h' characters");
        System.out.println(searchstr);
    }
}

Found 2 'h' characters
hello how are you.