日期Calendar

import java.util.*;
import java.text.*;
class DateDemo
{
    public static void main(String[] arhgs)
    {
        String[] month={"一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"};
        String[] week={"","星期一","星期二","星期三","星期四","星期五","星期六","星期日"};
         Calendar cl=Calendar.getInstance();
         int index=cl.get(Calendar.MONTH);
         int indexweek=cl.get(Calendar.WEEK_OF_MONTH);
         
        sop(cl.get(Calendar.YEAR)+"年"+cl.get(Calendar.MONTH)+"月"+cl.get(Calendar.DAY_OF_MONTH)+"日");
        sop(month[index]);
        sop(week[indexweek]);
        /*
         *
        Date d=new Date();
        sop(d);
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy年");
        String obj=sdf.format(d);
        sop(obj);
         **/
    }
    public static void sop(Object obj)
    {
        System.out.println(obj);
    }
}

Calendar cl=Calendar.getInstance();
// cl.set(2011,3,3);
cl.add(Calendar.MONTH,-4);
sop(cl.get(Calendar.YEAR)+"年"+cl.get(Calendar.MONTH)+"月"+cl.get(Calendar.DAY_OF_MONTH)+"日");