我要找到所有周六和周日在特定的月份。我该怎么办呢?
I want find all Saturdays and Sundays in A given month. How can I do so?
在简单的办法是只遍历该月的日子,检查一周的某一天为他们每个人。例如:
The simplest way is to just iterate over all the days in the month, and check the day of week for each of them. For example:
// This takes a 1-based month, e.g. January=1. If you want to use a 0-based
// month, remove the "- 1" later on.
public int countWeekendDays(int year, int month) {
Calendar calendar = Calendar.getInstance();
// Note that month is 0-based in calendar, bizarrely.
calendar.set(year, month - 1, 1);
int daysInMonth = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
int count = 0;
for (int day = 1; day <= daysInMonth; day++) {
calendar.set(year, month - 1, day);
int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK);
if (dayOfWeek == Calendar.SUNDAY || dayOfweek == Calendar.SATURDAY) {
count++;
// Or do whatever you need to with the result.
}
}
return count;
}
我的绝对保证的有这样做的更有效的方法 - 但是这就是我想要开始什么,以及优化的时候我会发现它太慢了
I'm absolutely sure there are far more efficient ways of doing this - but that's what I'd start with, and optimize when I'd found it's too slow.
请注意,如果你能使用约达时间这将使你的生活轻松了许多。 ..
Note that if you're able to use Joda Time that would make your life a lot easier...