import javax.swing.*;
public class Calendar {
public static void main(String[] args) {
// Prompt the user to enter input
String yearInput = JOptionPane.showInputDialog("Enter a year:");
int year = Integer.parseInt(yearInput);
String firstDayInput = JOptionPane
.showInputDialog("Enter the first day of the year:");
int firstDay = Integer.parseInt(firstDayInput);
int startDay = firstDay;
int numOfDaysInMonth = 0;
for (int month = 1; month <= 12; month++) {
System.out.print(" ");
switch (month) {
case 1:
System.out.println("January/" + year);
numOfDaysInMonth = 31;
break;
case 2:
System.out.println("Feburay/" + year);
if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
numOfDaysInMonth = 29;
else
numOfDaysInMonth = 28;
break;
case 3:
System.out.println("March/" + year);
numOfDaysInMonth = 31;
break;
case 4:
System.out.println("April/" + year);
numOfDaysInMonth = 30;
break;
case 5:
System.out.println("May/" + year);
numOfDaysInMonth = 31;
break;
case 6:
System.out.println("June/" + year);
numOfDaysInMonth = 30;
break;
case 7:
System.out.println("July/" + year);
numOfDaysInMonth = 31;
break;
case 8:
System.out.println("August/" + year);
numOfDaysInMonth = 31;
break;
case 9:
System.out.println("September/" + year);
numOfDaysInMonth = 30;
break;
case 10:
System.out.println("October/" + year);
numOfDaysInMonth = 31;
break;
case 11:
System.out.println("November/" + year);
numOfDaysInMonth = 30;
break;
case 12:
System.out.println("December/" + year);
numOfDaysInMonth = 31;
break;
}
System.out.println("_______________________________");
System.out.println(" Sun Mon Tue Wed Thu Fri Sat");
int i=0;
for(i=0;i<startDay;i++)
System.out.print(" ");
for(i=1;i<=numOfDaysInMonth;i++){
if(i<10)
System.out.print(" "+i);
else
System.out.print(" "+i);
if((i + startDay) % 7 == 0)
System.out.println();
}
System.out.println();
System.out.println();
startDay = (startDay + numOfDaysInMonth) % 7;
}
}
}