????++++++++++++++++++++++++++++++++++++++++++++++
????java.util?????? ???е??????????? Date??calendar??
????1.Date ?? ?? ??????? ????????????????????????
????Date date=new Date();
????????? ?????????
????2.?????????????????SimpleDateFormate??
????????? ?????? String geshi="yyyy??MM??dd??HHС?mm??ss??";
????SimpleDF sdf=new SDF(geshi);
????Date d=new Date();
?????????????? ??? String time=sdf.format(d);
?????????????У????? ?????????? ?????????????? ???????
????String birth="1987-02-02";
????Date dd=sdf.parse(birth);  // ?? sdf ???? ??? ???? ??
????++++++++++++++++++++++++++++++++++++++++++++++++++++++++
????3. ????????? ?????????calendar ????????????????
?????????????? calendar cc=calendar.getInstance();
???????????? cc.getTime();???????????? Date ????????
?????????? cc.add??calendar.DATE??-1????// ??? ????? date????
????————————————————————————————————————————
????????????????? ???????? cc.set(2011??01??05)???????????????
????get(); ???? ???????? ????cc.get(calendar.DAY_OF_WEEK);????????????
????+++++++++++++++++++++++++++++++++++++++++++++++++++++