将Date对象转换为日历对象 [英] Converting a Date object to a calendar object

问题描述

所以我得到一个来自传入对象的日期属性，形式如下：

So I get a date attribute from an incoming object in the form:

Tue May 24 05:05:16 EDT 2011

我写一个简单的帮助方法将其转换为日历方法，代码：

I am writing a simple helper method to convert it to a calendar method, I was using the following code:

    public static Calendar DateToCalendar(Date date ) 
{ 
 Calendar cal = null;
 try {   
  DateFormat formatter = new SimpleDateFormat("yyyyMMdd");
  date = (Date)formatter.parse(date.toString()); 
  cal=Calendar.getInstance();
  cal.setTime(date);
  }
  catch (ParseException e)
  {
      System.out.println("Exception :"+e);  
  }  
  return cal;
 }

要模拟传入对象，我只是在当前使用的代码：

To simulate the incoming object I am just assigning the values within the code currently using:

private Date m_lastActivityDate = new Date();

但是这是一个空指针，一旦方法到达：

However this is givin me a null pointer once the method reaches:

date = (Date)formatter.parse(date.toString()); 

推荐答案

以下是您的方法：

public static Calendar toCalendar(Date date){ 
  Calendar cal = Calendar.getInstance();
  cal.setTime(date);
  return cal;
}

你所做的一切都是错误的和不必要的。

Everything else you are doing is both wrong and unnecessary.

BTW，Java命名约定建议方法名以小写字母开头，因此应为： dateToCalendar 或 toCalendar （如图所示）。

BTW, Java Naming conventions suggest that method names start with a lower case letter, so it should be: dateToCalendar or toCalendar (as shown).

？

DateFormat formatter = new SimpleDateFormat("yyyyMMdd");
date = (Date)formatter.parse(date.toString()); 

DateFormat 用于将字符串转换为日期（ parse（））或日期到字符串（ format（））。您正在使用它来解析日期的字符串表示回到日期。这不可能是对的，可以吗？

DateFormat is used to convert Strings to Dates (parse()) or Dates to Strings (format()). You are using it to parse the String representation of a Date back to a Date. This can't be right, can it?

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