首页 \ 问答 \ Java - 它是一个编译器错误,什么时候是运行时异常?(Java - When is it a compiler error and when is it a runtime exception?)

Java - 它是一个编译器错误,什么时候是运行时异常?(Java - When is it a compiler error and when is it a runtime exception?)

我目前正在使用Sierra和Bates学习指南学习SCJP认证,并且在许多自测(模拟考题)中,我一直在遇到同样的问题 - 我无法分辨某个特定错误是否会在运行时出现(一个异常)或编译时(编译错误)。 我知道这是一个模糊的问题,它可能无法回答,但是,如何判断在编译时或运行时是否会发现错误? 你能给我发送一些可能能够帮助我的网站链接吗?


I am currently studying for the SCJP certification using the Sierra and Bates Study Guide and in many of the self tests (mock exam questions) I keep running into the same problem - I can't tell whether a particular error will be at runtime (an exception) or at compile (compile error). I know this is a bit of a vague question and that it might not be possible to answer but, how can I tell if an error will be found at compile or at runtime? Would you be able to send me some website links that might be able to help me?


原文:https://stackoverflow.com/questions/3179504
更新时间:2024-01-24 16:01

最满意答案

我认为你的意思是用户不能在10年之前添加任何日期吗? 或者您的用户大多是10到0岁的孩子?!

由于您的限制日期基于当前日期,因此您必须使用setMinDate(long date)setMaxDate(long date)以编程方式设置限制。 正如您所看到的那样,这些方法的工作日期为毫秒,因此您必须首先以毫秒为单位:

Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.YEAR, -10);                //Goes 10 Year Back in time ^^
long upperLimit = calendar.getTimeInMillis();    //Get date in millisecond (epoch)

,然后使用上述方法设置限制:

datePicker.setMaxDate(upperLimit);

I think you mean users can't add any date earlier than 10 year before right? Or your users are mostly kids aged 10 to 0?!

Since your limit date is based on current date, you have to set limit programmatically using setMinDate(long date) and setMaxDate(long date). As you can see those method works with date in millisecond so you have to get dare in millis first:

Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.YEAR, -10);                //Goes 10 Year Back in time ^^
long upperLimit = calendar.getTimeInMillis();    //Get date in millisecond (epoch)

, and then set the limit using above method:

datePicker.setMaxDate(upperLimit);

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