关于日历的问题，帮忙解答一下
import java.util.Scanner;public class Q{
public static void main(String[] args){
Scanner in = new Scanner(System.in);
System.out.println("请输入年份：");
int year = in.nextInt();
System.out.println("请输入月份：");
int month = in.nextInt();
int sum = 0;
for (int i=1900; i<year; i++){
if(year%4==0&&year%100!=0||year%400==0){
sum+=366;
}
else{
sum+=365;
}
}
for(int i=1; i<month; i++){
if(i==2){
if(year%4==0&&year%100!=0||year%400==0){
sum+=29;
}
else{
sum+=28;
}
}
else{
if(i==4||i==6||i==9||i==11){
sum+=30;
}
else{
sum+=31;
}
}
}
sum+=3;
int wekday = sum%7;
System.out.println("一\t二\t三\t四\t五\t六\t日");
for(int i=1;i<=wekday;i++){
System.out.print("\t");
}
for(int i=1;i<=30;i++){
if(sum%7==6){
System.out.print(i+"\n");
}
else{
System.out.print(i+"\t");
}
sum++;
}
}
}
