月历卡片

//import java.util.Calendar;
import java.util.Scanner;
public class Main {
            public static void main(String args[]) throws Exception {
                   Scanner input = new Scanner(System.in);                     
                    int y=input.nextInt(); 
                    int m=input.nextInt(); 
                   
                    String[] ms ={"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"};
                    System.out.println("    " + y+"年"+ms[m-1]);
                    System.out.println("日 一 二 三 四 五 六"); 
                    int days = getDaysOfMonth(y,m);                  
                    int week = getWeek(y,m);
                   
                    for(int i =0;i<week;i++)
                    {
                     StdOut.print("   "); 
                    }
                    int site=1;
                    for(int j=1;j<=7 - week;j++)
                    {
                     StdOut.printf("%2d ", j);
                     site=j;
                    }
                    System.out.println();
                   
                    for(int i=site+1;i<=days;i++)
                    {
                     StdOut.printf("%2d ", i);
                     if((i-site) %7==0)System.out.println();                     
                    }
                  }
                 
            private static int getDaysOfMonth(int year,int month)
            {
             /*
             Calendar cal = Calendar.getInstance();
             cal.set(Calendar.YEAR, year); 
             cal.set(Calendar.MONTH, month-1); 
             int days_of_month = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
             return days_of_month;
             */
             int[] months={31,28,31,30,31,30,31,31,30,31,30,31};
             
             if((year%4==0&&year%100!=0)||(year%400==0))
             {
              months[1]=29;
             }
             return months[month-1];
            }
           
            private static int getWeek(int year,int month)
            {
             int a = (14-month)/12;
             int y=year-a;
             int m=month+12*a -2;
             int day = 1;
             int week=(day+y+y/4-y/100+y/400+31*m/12)%7; 
             return week;
            }
}