Slag learning path (1) output the calendar page of a certain month of a certain year

Java Output the calendar page of a year and a month
Input the date through the keyboard, and output the calendar page in the transfer function ：

package dy;
import java.util.Calendar;
import java.util.Scanner;
public class DDy{
    
 public static void main(String args[]){
    
  Scanner in=new Scanner(System.in);
  System.out.println(" Please enter the year ：");
  int year=in.nextInt();
  System.out.println(" Please enter the month ：");
  int month=in.nextInt();
  in.close();
  Calendar  The calendar =Calendar.getInstance();
   The calendar .set(year,month,1);
  int  What day = The calendar .get(Calendar.DAY_OF_WEEK)-1;
  int day=0;
   if(month==1||month==3||month==5||month==7||month==8||month==10||month==12){
    
    day=31;
    System.out.println(" Total in this month ："+day+' God ');
   }
   else
    if(month==4||month==6||month==9||month==11){
    
     day=30;
     System.out.println(" Total in this month ："+day+' God ');
     }
    else
     if(month==2){
    
      if(year%4==0&&year%100!=0||year%400==0){
    
       day=29;
       System.out.println(" Total in this month ："+day+' God ');
       }
       else
        day=28;
        System.out.println(" Total in this month ："+day+' God ');
       }
 String c[]=new String[ What day +day];
  for(int j=0;j< What day ;j++){
    
   c[j]="";
   }
  for(int j= What day ,n=1;j< What day +day;j++){
    
   c[j]=String.valueOf(n);
   n++;
   }
 
  System.out.printf("%14c%14c%14c%14c%14c%14c%14c\n",' Japan ',' One ',' Two ',' 3、 ... and ',' Four ',' 5、 ... and ',' 6、 ... and ');
  for(int j=0;j<c.length;j++){
    
   if(j%7==0&&j!=0)
    System.out.printf("\n");
   System.out.printf("%5s",c[j]);
   }
  }
 }