카멜 표기법 변환용 JAVA

    /**
     * 문자열 카멜 표기법 변환
     * @param str
     * @return camel_Str
     */
    public static String getStrToCamel(String str) {
        if (str.indexOf('_') < 0 && Character.isLowerCase(str.charAt(0))) {
            return str;
        }
 
        StringBuilder result = new StringBuilder();
        boolean nextUpper = false;
        int len = str.length();
 
        for (int i = 0; i < len; i++) {
            char currentChar = str.charAt(i);
            if (currentChar == '_') {
                nextUpper = true;
            } else {
                if (nextUpper) {
                    result.append(Character.toUpperCase(currentChar));
                    nextUpper = false;
                } else {
                    result.append(Character.toLowerCase(currentChar));
                }
            }
        }
        return result.toString();
    }