面试题——日历相关

Calendar instance = Calendar.getInstance();today = instance.get(Calendar.DAY_OF_MONTH);//今天是这个月的几号instance.set(Calendar.DAY_OF_MONTH, 1);//将日历设置成当月的1号firstDayOffset = instance.get(Calendar.DAY_OF_WEEK) - 1;//本月1号是星期几instance.roll(Calendar.DAY_OF_MONTH, -1);//将日历从1号向后翻滚至本月最后一天，获取本月天数daysOfMonth = instance.get(Calendar.DAY_OF_MONTH);instance.roll(Calendar.MONTH, -1);//将月份-1instance.set(Calendar.DAY_OF_MONTH, 1);设置为上月1号instance.roll(Calendar.DAY_OF_MONTH, -1);设置为上月最后一天daysOfLastMonth = instance.get(Calendar.DAY_OF_MONTH);//获取上月天数
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