public static void main(String[] args) {

        String str = new String("abcd");

        System.out.println("원본 문자열 : " + str);

        System.out.println(str.compareTo("bcef"));

        System.out.println(str.compareTo("abcd"));

        System.out.println(str.compareTo("Abcd"));

        System.out.println(str.compareToIgnoreCase("Abcd"));

        System.out.println("compareTo() 메소드 호출 후 원본 문자열 : " + str);

    }

}