我编辑的JAVA日历程序

class calendar
 {
    public static void main(String[]args)
   {
      int yearIn ;
      yearIn = Integer.parseInt(args[0]);
      showDays(yearIn);
    }
      static void showDays(int year)
       {  int month = 1;
          out:
          for(;month<13;month++)
               { switch(month)
                  {
                  case 1:
                  for(int day = 1;day<32;day++)
                      {System.out.println(month+"月"+day+"日");
                       }
                  continue;
                  case 2:
                  int count =0;
                  if((year % 4)!=0)
                      {count = 28;}
                  else if((year % 100==0)&(year % 400 != 0))
                      {count = 28;}
                  else
                       {count = 29;}
                  for(int day=1;day<=count;day++)
                      {System.out.println(month+"月"+day+"日");
                       }
                   continue;
                  case 3:
                  for(int day = 1;day<32;day++)
                      {System.out.println(month+"月"+day+"日");
                       }
                  continue;
                  case 4:
                  for(int day = 1;day<31;day++)
                      {System.out.println(month+"月"+day+"日");
                       }
                  continue;
                   case 5:
                  for(int day = 1;day<32;day++)
                      {System.out.println(month+"月"+day+"日");
                       }
                  continue;
                   case 6:
                  for(int day = 1;day<31;day++)
                      {System.out.println(month+"月"+day+"日");
                       }
                  continue;
                  case 7:
                  for(int day = 1;day<32;day++)
                      {System.out.println(month+"月"+day+"日");
                       }
                  continue;
                  case 8:
                  for(int day = 1;day<32;day++)
                      {System.out.println(month+"月"+day+"日");
                       }
                  continue;
                  case 9:
                  for(int day = 1;day<31;day++)
                      {System.out.println(month+"月"+day+"日");
                       }
                  continue;
                  case 10:
                  for(int day = 1;day<32;day++)
                      {System.out.println(month+"月"+day+"日");
                       }
                  continue;
                  case 11:
                  for(int day = 1;day<31;day++)
                      {System.out.println(month+"月"+day+"日");
                       }
                  continue;
                  case 12:
                  for(int day = 1;day<32;day++)
                      {System.out.println(month+"月"+day+"日");
                       }
                  continue;
                   }
                  }

         }

  }