使用自定义字符串初始化静态最终日期 [英] Initialize static final Date using custom String

问题描述

我正在使用Java并遇到一个随机问题. 在这里，我共享了我的问题的示例代码.

I am working with Java and come through one random problem. Here I had shared sample code of my problem.

我想用我的自定义字符串格式初始化一些静态最终日期字段.

I want to initialize some of static final date field with my custom string format.

public class Sample {
    protected static final Date MAX_DATE ;
    static {
        try {
            MAX_DATE = new SimpleDateFormat("yyyy-MM-dd").parse("2099-12-31");
        } catch (ParseException e) {
            e.printStackTrace();
        }

    }
}

直接放在线下时，它要求尝试并抓住.

While directly putting below line, it's asking for try and catch.

protected static final Date MAX_DATE= new SimpleDateFormat("yyyy-MM-dd").parse("2099-12-31");

当我添加了上面代码中提到的try and catch时，它会引发错误

When I had added try and catch as mentioned in above code, it's throwing an error

变量"MAX_DATE"可能尚未初始化

Variable 'MAX_DATE' might not have been initialized

在使用下面的代码初始化时，它开始在第5行上抛出Cannot assign a value to final variable 'MAX_DATE'错误.

While initialize with below code, it started throwing an error of Cannot assign a value to final variable 'MAX_DATE' on line number 5.

protected static final Date MAX_DATE=null;

有人可以帮助我解决这个问题吗?

Can somebody help me in this issue?

推荐答案

如果只需要一个简单的日期，则应使用LocalDate而不是Date:

If you just need a plain date, you should use LocalDate instead of Date:

protected static final LocalDate MAX_DATE = LocalDate.of(2099, 12, 31);

如果(由于某种原因)必须从字符串中获取日期，则也可以按以下方式使用它:

If (for whatever reason) the date has to be taken from a String, you can also use it as follows:

protected static final LocalDate MAX_DATE = LocalDate.parse("2099-12-31");

万一真的很难做到

• 具有从任意模式的String解析的日期，并且
• 使用良好的语言java.util.Date

类似的事情应该可以解决问题:

something like that should do the trick:

protected static final LocalDate MAX_DATE = Date.from(LocalDate.parse("2088||12||31", DateTimeFormatter.ofPattern("yyyy||MM||dd")).atStartOfDay(ZoneId.systemDefault()).toInstant());

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