英文:
user input validation: date input
问题
以下是你的代码部分，我已经将其翻译好：
private static void extracted2(Doctor l1, Patient p1, List<Schedule> lista) {Scanner sc2 = new Scanner(System.in);System.out.println("请提供日期，格式为 M/d/yyyy");while (true) {try {String userinput = sc2.next();DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern("M/d/yyyy");LocalDate date = LocalDate.parse(userinput, dateFormat);Schedule g5 = new Schedule(5, l1, p1, date, false, false);lista.add(g5);for (Schedule x : lista) {System.out.println(x);}} catch (DateTimeParseException e) {System.out.println("输入有误，请重新输入正确的日期数据：" + e.getMessage());}}}
注意：我将DataFormatException更改为DateTimeParseException，因为在Java中，日期时间解析错误通常会抛出DateTimeParseException异常。
英文:
I have a method below which asks user to provide date from they keyboard, I need to extend my code to validate if user indeed entered the data in format M/d/yyyy.
If not, ask again to repeat and correct input data, how can I implement that?
private static void extracted2(Doctor l1, Patient p1, List<Schedule> lista) {Scanner sc2 = new Scanner(System.in);System.out.println("provide data with format M/d/yyyy");while (true) {try {String userinput = sc2.next();DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern("M/d/yyyy");LocalDate date = LocalDate.parse(userinput, dateFormat);Schedule g5 = new Schedule(5, l1, p1, date, false, false);lista.add(g5);for (Schedule x : lista) {System.out.println(x);}} catch (DataFormatException e) {System.out.println("Wrong data " + e.getMessage());}}}
答案1
得分: 0
我认为你已经接近了，但这是最终的解决方案：
从代码中删除了其他逻辑，因为可以随后添加。
Scanner sc2 = new Scanner(System.in);LocalDate date = null;boolean isValid;do {try {System.out.println("提供日期格式 M/d/yyyy");DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern("M/d/yyyy");String userinput = sc2.next();date = LocalDate.parse(userinput, dateFormat);isValid = true;} catch (DateTimeParseException exception) {isValid = false;}} while(!isValid);System.out.println(date);
输出：
> 提供日期格式 M/d/yyyy> 333> 提供日期格式 M/d/yyyy> 444> 提供日期格式 M/d/yyyy> 1/2/2020> 2020-01-02
英文:
I think you are close but here is the final solution:
Removed other logic from the code since it can be added.
Scanner sc2 = new Scanner(System.in);LocalDate date = null;boolean isValid;do {try {System.out.println("Provide date format M/d/yyyy");DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern("M/d/yyyy");String userinput = sc2.next();date = LocalDate.parse(userinput, dateFormat);isValid = true;} catch (DateTimeParseException exception) {isValid = false;}} while(!isValid);System.out.println(date);
output:
> Provide date format M/d/yyyy
> 333
> Provide date format M/d/yyyy
> 444
> Provide date format M/d/yyyy
> 1/2/2020
> 2020-01-02
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