在Java中的日历对象中添加DAY_OF_MONTH或DAY_OF_YEAR的区别是什么？ [英] What's the difference b/w adding DAY_OF_MONTH or DAY_OF_YEAR to a Calendar object in Java?

问题描述

我想将某个日期增加1天。我创建一个日历对象，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);

或

cal.add(Calendar.DAY_OF_YEAR, 1);

还有其他DAY常量，但是我使用上述2种方法得到相同的结果增加一天1.在这种情况下，我会得到两个不同的结果？

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

添加它真的没有什么区别，但这个

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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