Display Calendars in Console Program

I am creating a program that prompts the user to enter a year and the first day of the month, Sun=0, Mon=1, etc . . . then shows that years calendar with the correct number date placement, but I am having severe trouble getting the actual numbered dates up... Honestly I am just not quite sure how to do it. The calendars need to be displayed in the console. Any help is appreciated... I'm just lost.

Here's what I have so far:

Code java:

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import javax.swing.JOptionPane;
 
public class test {
 
    public static void main(String[] args) {
 
 
 
 
       // Prompt the user to enter input
    String yearString = JOptionPane.showInputDialog("Enter a year:");
    int year = Integer.parseInt(yearString);
 
    String firstDayString = JOptionPane.showInputDialog("Enter the first day of the year:");
    int firstDay = Integer.parseInt(firstDayString);
 
    int numberOfDaysInMonth = 0;
 
 
 
    // Display calendar for each month
    for (int month = 1; month <= 12; month++) {
      // Display Calendar title
      switch (month) {
        case 1: System.out.printf("                        January\n");
            System.out.printf("=======================================================\n");
            System.out.printf("Sun     Mon     Tues     Wed      Thurs     Fri     Sat\n");
                numberOfDaysInMonth = 31;
                break;
        case 2: System.out.printf("                        February\n");
            System.out.printf("=======================================================\n");
            System.out.printf("Sun     Mon     Tues     Wed      Thurs     Fri     Sat\n");
                if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
                  numberOfDaysInMonth = 29;
                else
                  numberOfDaysInMonth = 28;
        break;
        case 3: System.out.printf("                        March\n");
            System.out.printf("=======================================================\n");
            System.out.printf("Sun     Mon     Tues     Wed      Thurs     Fri     Sat\n");
        numberOfDaysInMonth = 31;
        break;
        case 4: System.out.printf("                        April\n");
            System.out.printf("=======================================================\n");
            System.out.printf("Sun     Mon     Tues     Wed      Thurs     Fri     Sat\n");
        numberOfDaysInMonth = 30;
        break;
        case 5: System.out.printf("                        May\n");
            System.out.printf("=======================================================\n");
            System.out.printf("Sun     Mon     Tues     Wed      Thurs     Fri     Sat\n");
        numberOfDaysInMonth = 31;
        break;
        case 6: System.out.printf("                        June\n");
            System.out.printf("=======================================================\n");
            System.out.printf("Sun     Mon     Tues     Wed      Thurs     Fri     Sat\n");
        numberOfDaysInMonth = 30;
        break;
        case 7: System.out.printf("                        July\n");
           System.out.printf("=======================================================\n");
            System.out.printf("Sun     Mon     Tues     Wed      Thurs     Fri     Sat\n");
        numberOfDaysInMonth = 31;
        break;
        case 8: System.out.printf("                        August\n");
            System.out.printf("=======================================================\n");
            System.out.printf("Sun     Mon     Tues     Wed      Thurs     Fri     Sat\n");
        numberOfDaysInMonth = 31;
        break;
        case 9: System.out.printf("                        September\n");
            System.out.printf("=======================================================\n");
            System.out.printf("Sun     Mon     Tues     Wed      Thurs     Fri     Sat\n");
        numberOfDaysInMonth = 30;
        break;
        case 10: System.out.printf("                        October\n");
            System.out.printf("=======================================================\n");
            System.out.printf("Sun     Mon     Tues     Wed      Thurs     Fri     Sat\n");
        numberOfDaysInMonth = 31;
        break;
        case 11: System.out.printf("                        November\n");
            System.out.printf("=======================================================\n");
            System.out.printf("Sun     Mon     Tues     Wed      Thurs     Fri     Sat\n");
        numberOfDaysInMonth = 30;
        break;
        case 12: System.out.printf("                        December\n");
            System.out.printf("=======================================================\n");
            System.out.printf("Sun     Mon     Tues     Wed      Thurs     Fri     Sat\n");
        numberOfDaysInMonth = 31;
        break;
      }
 
 
//      switch (firstDay) {
//       
//        case 0: System.out.println("Sunday"); break;
//        case 1: System.out.println("Monday"); break;
//        case 2: System.out.println("Tuesday"); break;
//        case 3: System.out.println("Wednesday"); break;
//        case 4: System.out.println("Thursday"); break;
//        case 5: System.out.println("Friday"); break;
//        case 6: System.out.println("Saturday"); break;
//      }
//      // Get the start day for the next month
firstDay = (firstDay + numberOfDaysInMonth) % 7;
    }
  }
}

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I just made this which displays the right format for one month... but if i kept this method up it would take up so many lines of code. My professor said that it must be done in under 150 lines.

Code java:

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public class NewClass {
 public static void main(String[] args) {
 
 for(int num1 = 1; num1 <= 7; num1++){
        System.out.print(num1 + "        ");
    }
     System.out.println("\n");
    for(int num2 = 8; num2 <= 14; num2++){
    System.out.print(num2+"       ");
    }
    System.out.println("\n");
    for(int num3 = 15; num3 <= 21; num3++){
        System.out.print(num3+"       ");
    }
     System.out.println("\n");
    for(int num4 = 22; num4 <= 28; num4++){
        System.out.print(num4+"       ");
    }
     System.out.println("\n");
    for(int num5 = 29; num5 <= 31; num5++){
        System.out.print(num5+"       ");
    }
 
        }
}

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