Java 根据时间获取某天周几

public static String getWeekOfDate(Date date) {
    /**
     *
     * 功能描述: 根据日期获取星期几
     *
     * @auther: lkj
     * @date: 2018/4/3 下午1:46
     * @param: [date]
     * @return: java.lang.String
     *
     */
    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];
}