java 获取指定日期为星期几的代码

public String getWeekOfDate(Date dt) {
String[] weekDays = {"日", "一", "二", "三", "四", "五", "六"};
Calendar cal = Calendar.getInstance();
cal.setTime(dt);
int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
if (w < 0)
w = 0;
return weekDays[w];
}