无法解析String到LocalDate（Java 8） [英] Can't parse String to LocalDate (Java 8)

问题描述

我的输入是2015年7月1日格式为01-07-2015的日期的字符串表示。我正在尝试将其解析为 java.time.LocalDate 变量：

My input is a String representation of a date in the format "01-07-2015" for July 1, 2015. I'm trying to parse this into a java.time.LocalDate variable:

final DateTimeFormatter DATE_FORMAT = DateTimeFormatter.ofPattern("dd-MM-YYYY");
final String input = "01-07-2015";
final LocalDate localDate = LocalDate.parse(input, DATE_FORMAT);

基于 DateTimeFormatter JavaDoc ，我希望这可行。但是，我收到了非常友好和乐于助人的消息：

Based on the DateTimeFormatter JavaDoc, I would expect this to work. However, I'm greeted with a very friendly and helpful message:

引起：java.time.DateTimeException：无法从中获取LocalDate TemporalAccessor：{DayOfMonth = 1，MonthOfYear = 7，WeekBasedYear [WeekFields [MONDAY，4]] = 2015}，ISO类型为java.time.format.Parsed

Caused by: java.time.DateTimeException: Unable to obtain LocalDate from TemporalAccessor: {DayOfMonth=1, MonthOfYear=7, WeekBasedYear[WeekFields[MONDAY,4]]=2015},ISO of type java.time.format.Parsed

我真的不明白这个异常告诉我的是什么。任何人都可以解释我出了什么问题吗？

I don't really understand what this exception is telling me. Can anyone explain me what's going wrong?

推荐答案

今年你必须使用小写y：

For year you have to use the lowercase y:

final DateTimeFormatter DATE_FORMAT = DateTimeFormatter.ofPattern("dd-MM-yyyy");

大写Y用于周年。有关更多详细信息，请参阅 DateTimeFormatter的javadoc 。

Uppercase Y is used for weekyear. See the javadoc of DateTimeFormatter for more details.

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