生成日历

package calender;

import java.util.Scanner;

public class Calendar {
static int year;
static int theFirstDayWeek;
public static void main(String[] args){
System.out.println("请输入日历的年份");
Scanner sc = new Scanner(System.in);
year = sc.nextInt();
theFirstDayWeek = firstDayWeek(year);
// System.out.println(theFirstDayWeek);
System.out.println(" "+year+"日历");
System.out.println("==========================================================");
for(int i =1 ;i<=12;i++){
printMonth(i);
System.out.println();
}
}
public static void printMonth(int month){
printHead(month);
int day = theMaxDay(month);
for (int i =1 ; i <=day;i++){
if(i<10)System.out.print(i+" ");
else System.out.print(i+" ");
theFirstDayWeek+=1;
if (theFirstDayWeek%7==0){
System.out.println();
System.out.print(" ");
theFirstDayWeek =0;
}
}

}

public static void printHead(int month){
System.out.println();
System.out.println(""+month+"月 日 一 二 三 四 五 六");
System.out.print(" ");
for (int i = 0; i<theFirstDayWeek;i++){
System.out.print(" ");
}
}

public static int firstDayWeek(int y){
int n = 0;
for (int i=0;i<y;i++){
if(isLeapYear(i)){
n+=1;
}
}
return ((y-1)*365+n)%7;

}
public static Boolean isLeapYear(int year){
return ((year%4==0&&year%100!=0)||year%400==0);
}
public static int theMaxDay(int month){
switch (month){
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
return 31;
case 4:
case 6:
case 9:
case 11:
return 30;
case 2:
if(isLeapYear( year))return 29;
else return 28;
default:
return 0 ;
}
}
}