将DAY_OF_MONTH或DAY_OF_YEAR添加到Calendar对象之间有什么区别？ [英] What's the difference between adding DAY_OF_MONTH or DAY_OF_YEAR to a Calendar object?

问题描述

我想将某个日期增加1天。我创建了一个Calendar对象，如：

I want to increase a certain date by 1 day. I create a Calendar object like:

Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, 2012);
cal.set(Calendar.MONTH, 0);
cal.set(Calendar.DAY_OF_MONTH, 31);

然后，为了增加1天，我可以做两件事：

Then, for increasing it by 1 day, I can do 2 things :

cal.add(Calendar.DAY_OF_MONTH, 1);

OR

cal.add(Calendar.DAY_OF_YEAR, 1);

还有其他DAY常量，但我使用上述两种方法获得相同的结果将这一天增加1.在这种情况下，我会得到两个不同的结果吗？

There are also other "DAY" constants, but I get the same result using the above 2 methods of increasing the day by 1. In which case will I get different results for the two?

推荐答案

对于添加它真的没什么区别，但是这个

For adding it really makes no difference, but this

Calendar c = Calendar.getInstance();
System.out.println(c.get(Calendar.DAY_OF_MONTH));
System.out.println(c.get(Calendar.DAY_OF_YEAR));

打印

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