(Display the first days of each month) Write a program that prompts the user to enter the year and first day of the year, and displays the first day of each month in the year. For example, if the user entered the year 2013, and 2 for Tuesday, January 1, 2013, your program should display the following output:January 1, 2013 is Tuesday...December …

DisplayFirstDayOfMonth_05_28.java

public class DisplayFirstDayOfMonth_05_28 {
  public static void main(String[] args) {
    java.util.Scanner input = new java.util.Scanner(System.in);

    // Prompt the user to enter input
    System.out.print("Enter a year: ");
    int year = input.nextInt();

    System.out.print("Enter the first day of the year: ");
    int firstDay = input.nextInt();

    int numberOfDaysInMonth = 0;

    // Display calendar for each month
    for (int month = 1; month <= 12; month++) {
      // Display Calendar title
      switch (month) {
        case 1: System.out.print("January 1, " + year + " is ");
                numberOfDaysInMonth = 31;
                break;
        case 2: System.out.print("February 1, " + year + " is ");
                if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))
                  numberOfDaysInMonth = 29;
                else
                  numberOfDaysInMonth = 28;
        break;
        case 3: System.out.print("March 1, " + year + " is ");
        numberOfDaysInMonth = 31;
        break;
        case 4: System.out.print("April 1, " + year + " is ");
        numberOfDaysInMonth = 30;
        break;
        case 5: System.out.print("May 1, " + year + " is ");
        numberOfDaysInMonth = 31;
        break;
        case 6: System.out.print("June 1, " + year + " is ");
        numberOfDaysInMonth = 30;
        break;
        case 7: System.out.print("July 1, " + year + " is ");
        numberOfDaysInMonth = 31;
        break;
        case 8: System.out.print("August 1, " + year + " is ");
        numberOfDaysInMonth = 31;
        break;
        case 9: System.out.print("September 1, " + year + " is ");
        numberOfDaysInMonth = 30;
        break;
        case 10: System.out.print("October 1, " + year + " is ");
        numberOfDaysInMonth = 31;
        break;
        case 11: System.out.print("November 1, " + year + " is ");
        numberOfDaysInMonth = 30;
        break;
        case 12: System.out.print("December 1, " + year + " is ");
        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;
    }
  }
}