3-22java的日子----日历的问题

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利用.Calendar日历类编写的接受年月日的参数，显示当年的年日历，但结果是日期与星期不对应，不知是哪里出了问题？？？？？？？？？？？

package Mainpackage;
import java.util.Calendar;

public class RiLi2013 {
public static void main(String[] args) {
  xianShi(2013,3,22);
}
public static void xianShi(int year, int month, int day) {
  int xingqi =0;
  String[] dayOfMonth=null;
  Calendar rili = Calendar.getInstance();
  for (int m = 1,days = 0; m <= 12; m++) {
   switch (m) {
   case 1:
   case 3:
   case 5:
   case 7:
   case 8:
   case 10:
   case 12:days = 31;break;
   case 4:
   case 6:
   case 9:
   case 11:days = 30;break;
   case 2:
    if ((year % 400 == 0) || (year % 4 == 0 && year % 100 != 0)) {
     days = 29;
    } else {
     days = 28;
    }
    break;
   }

   rili.set(year, m, day);
   System.out.println();
   System.out.println(" 日   一   二   三   四   五   六 "+" 2013年"+m+"月" );
   xingqi = rili.get(Calendar.DAY_OF_WEEK) -1;//本月1号是周几
   dayOfMonth = new String[xingqi + days];
   for (int i = 0; i < xingqi; i++) {
    dayOfMonth[i] = "**";
   }
   for (int i = xingqi, n = 1; i < xingqi + days; i++) {
    if (n <= 9)
     dayOfMonth[i] = String.valueOf(n) + " ";
    else
     dayOfMonth[i] = String.valueOf(n);
    n++;
   }
   for (int i = 0; i < dayOfMonth.length; i++) {
    if (i % 7 == 0) {
     System.out.println();
    }
    System.out.print(" " + dayOfMonth[i]);
   }
   System.out.println();
  }
}
}