如何找到给定月份的周六和周日？

在 最简单 的方法是只迭代所有在一个月的日子里，检查一周的某一天为他们每个人。例如：

// 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 绝对可以确定 ，这样做的方式要高效得多-但这就是我的出发点，当发现速度太慢时进行优化。

请注意，如果您能够使用Joda Time，那将使您的生活更加轻松…