//首字母轉小寫  public static String toLowerCaseFirstOne(String s){    if(Character.isLowerCase(s.charAt(0)))      return s;    else      return (new StringBuilder()).append(Character.toLowerCase(s.charAt(0))).append(s.substring(1)).toString();  }  //首字母轉大寫  public static String toUpperCaseFirstOne(String s){    if(Character.isUpperCase(s.charAt(0)))      return s;    else      return (new StringBuilder()).append(Character.toUpperCase(s.charAt(0))).append(s.substring(1)).toString();  }