Java-如何检查值是否为日期类型 [英] Java - How to check if a value is of type Date

问题描述

我有一个项目要求。 .txt中的值为-

I have a project requirement. There are values in a .txt as -

 02/01/2017 00:00:00

我怎样才能做到这一点？谢谢。我是Java的新手，所以对您的帮助非常感谢。谢谢

Now I need to have some rules to check if this value in the data file is of type Date. How can I do that? Thanks. I am new to Java so any help much appreciated. Thanks

推荐答案

如果您只希望有效期，请使用非宽容语法：

If you just want valid days, use non-lenient parsing:

String dateString = "02/28/2017 00:00:00";

DateFormat df = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
df.setLenient(false);
Date date;
try {
    date = df.parse(dateString);
    System.out.println(date);
} catch (ParseException e) {
    e.printStackTrace();
}

对于2月31日这样的不存在的日子，这将引发例外情况

This will throw an exception for non-existing days like the 31st of February

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