// 大小寫ASCII碼固定差距static int gap = 'a'-'A';public static void main(String[] args) {String str = "person_first_name";String result = parseStrToCammeCase(str);System.out.println(result);System.out.println(parseCameCaseToStr(result));}private static String parseStrToCammeCase(String str) {StringBuilder sb = new StringBuilder();boolean needToUpperCase = false;for(int i=0;i<str.length();i++){char ch = str.charAt(i);if(needToUpperCase){if('a'<ch && ch<'z'){char temp = (char)(ch-gap);sb.append(temp);}needToUpperCase = false;continue;}if(ch=='_'){needToUpperCase = true;}else {sb.append(ch);}}return sb.toString();}private static String parseCameCaseToStr(String str){StringBuilder sb = new StringBuilder();for(int i=0;i<str.length();i++){char ch = str.charAt(i);if('A'<=ch && ch<='Z'){char temp = (char)(ch+gap);sb.append("_"+temp);}else {sb.append(ch);}}return sb.toString();}

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