calendar Printer

import java.util.Scanner;
import java.util.Formatter;

/**
 * Description goes here.
 *
 * Last Modified: 2/14/23
 * Author: Brock Hansen
 */

public class DisplayMonth {

   private static int[] monthDays = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
   private static String[] monthNames = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
   private static int weekStart;
   private static int displayMonth;
   private static int maxDays;
   private static int leapYear = 2;

    public static void main(String[] args) {

      //Gets day the week starts on
      //Asks for user input until receives an int between 1-7, inclusive
      while( weekStart < 1 || weekStart > 7) {
           System.out.println("What day does the month start on? Enter a number between 1-7 (1=Monday, 2=Tuesday, 3=Wednesday...)");
         Scanner scan = new Scanner(System.in);
         weekStart = scan.nextInt();

         if( weekStart < 1 || weekStart > 7 ) {
            System.out.println("Not a valid option! Please pick a number between 1-7!");
         }
         scan.close();
      }

      //Gets month to display, if february then asks if leap year
      //Asks for user input until receives an int between 1-12, inclusive. If february (2), asks if leap year (int 0 or 1)
      while( displayMonth < 1 || displayMonth > 12) {
           System.out.println("What month would you like to display? Enter a number between 1-12 (1=January, 2=February, 3=March...)");
         Scanner scan = new Scanner(System.in);
         displayMonth = scan.nextInt();

         if( displayMonth < 1 || displayMonth > 12 ) {
            System.out.println("Not a valid option! Please pick a number between 1-12!");

            //Is february?
         } else if( displayMonth == 2 ) {

            //Asks if leap year or not
            while( leapYear < 0 || leapYear > 1) {
                 System.out.println("Is this a leap year? 0=no, 1=yes");
               leapYear = scan.nextInt();

               if( leapYear < 0 || leapYear > 1 ) {
                  System.out.println("Not a valid option! Please pick either 0 or 1!");
               }
            }
         }
         scan.close();
      }

      //set max days to count to for calendar
      //if february, check if leap year. else grab from list
      maxDays = displayMonth==2 ? ( leapYear==0 ? 28 : 29 ) : monthDays[displayMonth-1];

      //Display calendar
      System.out.println(monthNames[displayMonth-1]);
      System.out.println("Su Mo Tu We Th Fr Sa");

      //Keeps track of how many days we've printed so far
      int dayCount = 1;

      //Print number grid for calendar
      for(int y = 0; y < 7; y++) {
         for(int x = 0; x < 7; x++) {
            //calculates the current position, assuming we are on a 2d grid w/ row lengths of 7
            int gridNum = y*7+x+1;

            //Print spaces until we get to the correct starting day, then print day numbers.
            //Print spaces when we are past the max days for this month
            if(gridNum >= weekStart && dayCount <= maxDays) {
               System.out.print(String.format("%" + 2 + "s", dayCount) + " ");
               dayCount++;
            } else {
               System.out.print("   ");
            }
         }
         //If we have printed all the days, break out of the for() loop.
         if(dayCount > maxDays) {
            break;
         }
         System.out.println();
      }
    }
}