Java获取上周一周末和上月初月末

/**
     * 获取上周一
     * @param date 当前时间
     * @return 上周一时间
     */
    public static Date getLastWeekMonday(Date date) {
        Date a = DateUtils.addDays(date, -1);
        Calendar cal = Calendar.getInstance();
        cal.setTime(a);
        cal.add(Calendar.WEEK_OF_YEAR, -1);
        cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        return cal.getTime();
    }


    /**
     * 获取上周日
     * @param date 当前时间
     * @return 上周日时间
     */
    public static Date getLastWeekSunday(Date date) {
        Date a = DateUtils.addDays(date, -1);
        Calendar cal = Calendar.getInstance();
        cal.setTime(a);
        cal.set(Calendar.DAY_OF_WEEK, 1);
        return cal.getTime();
    }


    /**
     * 获取上月第一天
     * @param date 当前时间
     * @return 上月第一天时间
     */
    public static Date getLastMonthDayOne(Date date) {
        Calendar calendar1 = Calendar.getInstance();
        calendar1.add(Calendar.MONTH, -1);
        calendar1.set(Calendar.DAY_OF_MONTH, 1);
        return calendar1.getTime();
    }


    /**
     * 获取上月最后一天
     * @param date 当前时间
     * @return 上月最后一天时间
     */
    public static Date getLastMonthLastDay(Date date) {
        Calendar calendar2 = Calendar.getInstance();
        calendar2.set(Calendar.DAY_OF_MONTH, 0);
        return calendar2.getTime();
    }