java 获取当前日期是星期几

/**
     * 获取当前日期是星期几
     *
     * @param dt
     * @return 当前日期是星期几
     */
    public static String getWeekOfDate(Date dt) {
        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(dt);

        int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
        if (w < 0)
            w = 0;

        return weekDays[w];
    }


Date date=new Date();
//今天是几号
int day=date.getDate();
System.out.println("Today is :"+day+"号");
Calendar c=Calendar.getInstance();
c.setTime(date);
//今天是这个星期的第几天
int week=c.get(Calendar.DAY_OF_WEEK);
System.out.println("week:"+c.get(Calendar.DAY_OF_WEEK));
//当前月的最后一天是几号
int lastday=c.getActualMaximum(Calendar.DAY_OF_MONTH);
System.out.println("这个月最后一天是:"+lastday+"号");