public static String nextDay(int day) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(now());
        cal.add(Calendar.DAY_OF_YEAR, day);
        return format(DF_DATE, cal.getTime());
    }
public static String nextDay(int day) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(now());
        cal.add(Calendar.DAY_OF_YEAR, day);
        return format(DF_DATE, cal.getTime());
    }
public static String nextDay ( int day ) { Calendar cal = Calendar . getInstance ( ) ; cal . setTime ( now ( ) ) ; cal . add ( Calendar . DAY_OF_YEAR , day ) ; return format ( DF_DATE , cal . getTime ( ) ) ; }
取得距离今天 day 日的日期

@param day
天数
@return 日期字符串
取得距离今天 day 日的日期