Java 判断一个日期是星期几

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public static String getWeekOfDate(String day, SimpleDateFormat dt) {Date date = null;try {date = dt.parse(day);} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();}if (date == null) {return "";}String[] weekDays = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };Calendar cal = Calendar.getInstance();cal.setTime(date);int w = cal.get(Calendar.DAY_OF_WEEK) - 1;if (w < 0) {w = 0;}return weekDays[w];}