从月份名称获取月份编号 [英] Get month number from month name

问题描述

我有这个。

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String monthName = br.readLine();

如何获取monthName变量中包含的月份数？
谢谢！

How to get month number which contain in monthName variable? Thanks!

推荐答案

使用Java的日历类。它可以将任何给定的字符串解析为有效的日历实例。
这是一个例子（假设月份是英文）。

Use Java's Calendar class. It can parse any given string into a valid calendar instance. Here is an example (assuming that the month is in english).

Date date = new SimpleDateFormat("MMMM").parse(monthName);
Calendar cal = Calendar.getInstance();
cal.setTime(date);
println(cal.get(Calendar.MONTH));

您可以在 SimpleDateFormat ：

String monthName = "März"; // German for march
Date date = new SimpleDateFormat("MMMM", Locale.GERMAN).parse(monthName);
Calendar cal = Calendar.getInstance();
cal.setTime(date);
println(cal.get(Calendar.MONTH));

默认情况下，Java使用用户的本地来解析字符串。

By default, Java uses the user's local to parse the string.

请记住，计算机从0开始计数。因此，1月将为0.如果您想要人类可读日期，则应格式化日历实例：

Keep in mind that a computer starts counting at 0. So, January will be 0. If you want a human readable date, you should format the calendar instance:

SimpleDateFormat inputFormat = new SimpleDateFormat("MMMM");
Calendar cal = Calendar.getInstance();
cal.setTime(inputFormat.parse(monthName));
SimpleDateFormat outputFormat = new SimpleDateFormat("MM"); // 01-12
println(outputFormat.format(cal.getTime()));

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