来自 Scanner 的 Java 输入日期在一行中
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Java input date from Scanner in one line
提问by Turo
I'm trying to read date from a user to pass to GregorianCalendar variable. Currently I have an awkward setup, where it reads line by line. Can you help with a solution that collects input in one line? I found SimpleDateFormat class, but I cannot find a good fit for this specific purpose.
我正在尝试从用户读取日期以传递给 GregorianCalendar 变量。目前我有一个尴尬的设置，它逐行读取。您能帮助解决在一行中收集输入的解决方案吗？我找到了 SimpleDateFormat 类，但找不到适合此特定目的的类。
Scanner time = new Scanner(System.in)
System.out.println("Type year: ");int y =time.nextInt();
System.out.println("Type month: ");int m =time.nextInt();
System.out.println("Type day: ");int d = time.nextInt();
System.out.println("Type hour: ");int h = time.nextInt();
System.out.println("Type minute: ");int mm = time.nextInt();
GregorianCalendar data = new GregorianCalendar(y,m,d,h,mm);
回答by Jon Skeet
I would suggest you read in a line of text, with a specific format, then use DateFormatto parse it. For example:
我建议您阅读具有特定格式的一行文本，然后用于DateFormat解析它。例如：
DateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm",
Locale.US);
System.out.println("Enter date and time in the format yyyy-MM-ddTHH:mm");
System.out.println("For example, it is now " + format.format(new Date()));
Date date = null;
while (date == null) {
String line = scanner.nextLine();
try {
date = format.parse(line);
} catch (ParseException e) {
System.out.println("Sorry, that's not valid. Please try again.");
}
}
If you can, use the Java 8 java.timeclasses, or Joda Time- with the same basic idea, but using the classes from those APIs. Both are muchbetter than using Dateand Calendar.
如果可以，请使用 Java 8java.time类或Joda Time- 具有相同的基本思想，但使用这些 API 中的类。两者都远低于使用更好的Date和Calendar。
