java - 如何从字符串中解析时间？

Question

我正在尝试使用扫描仪将字符串 (11:23) 解析为 LocalDateTime，但出现异常： 无法解析文本“11:23”：无法从 TemporalAccessor 获取 LocalDateTime：{}，ISO 解析为 11:23键入 java.time.format.Parsed

 Scanner scanner = new Scanner(System.in);
 String timeGivenByUserString;
 DateTimeFormatter timeFormatter = DateTimeFormatter.ofPattern("HH:mm");

  System.out.println("Type the time HH:mm");
        try {

            do {
                timeGivenByUserString = scanner.nextLine();
            } while (!timeGivenByUserString.matches("\\d{2}:\\d{2}"));
            LocalDateTime timeGivenByUser = LocalDateTime.parse(timeGivenByUserString, timeFormatter);
            System.out.println(timeGivenByUser.format(timeFormatter));

        } catch (DateTimeParseException e) {
            System.out.println(e.getMessage());
        }

我也创建了类似的方法，它工作得很好：

    private static void askAboutDate() {
        Scanner scanner = new Scanner(System.in);
        String dateGivenByUserString;
        DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("dd.MM.yyyy");

        System.out.println("Type the date dd.MM.yyyy");
        try {

            do {
                dateGivenByUserString = scanner.nextLine();
            } while (!dateGivenByUserString.matches("\\d{2}.\\d{2}.\\d{4}"));
            LocalDate dateGivenByUser = LocalDate.parse(dateGivenByUserString, dateFormatter);
            System.out.println(dateGivenByUser.format(dateFormatter));

        } catch (DateTimeParseException e) {
            System.out.println(e.getMessage());
        }
    }

标签： javaparsingtimelocaltime

Answer 1

解决方案：将 LocalDateTime 更改为 LocalTime

  Scanner scanner = new Scanner(System.in);
        String timeGivenByUserString;
        DateTimeFormatter timeFormatter = DateTimeFormatter.ofPattern("HH:mm");

        System.out.println("Type the time HH:mm");
        try {

            do {
                timeGivenByUserString = scanner.nextLine();
            } while (!timeGivenByUserString.matches("\\d{2}:\\d{2}"));
            LocalTime timeGivenByUser = LocalTime.parse(timeGivenByUserString, timeFormatter);
            System.out.println(timeGivenByUser.format(timeFormatter));

        } catch (DateTimeParseException e) {
            System.out.println(e.getMessage());
        }