public static void main(String[] args) {

        System.out.println(upperCaseFirst("barer"));

    }

    public static  String upperCaseFirst(String str){

        return upperCase(str.substring(0, 1)) + str.substring(1);

    }

    public static String upperCase(String str) {

        char[] ch = str.toCharArray();

        if (ch[0] >= 'a' && ch[0] <= 'z') {

            ch[0] = (char) (ch[0] - 32);

        }

        return new String(ch);

    }