Leap Year, Month, determination program

Question

Hi - it's the learning student again :) Our new assignment is to create a program to determine leap year, month and day information. So basically you enter a year and the program says if it is a leap year. Then you enter a month and the program determines if that month is part of that leap year. And then you enter a day and determine if that day is part of that leap month that is part of that leap year. I have written a program to determine if it is a leap year and to determine that if the month is february it is a leap month, but not if the month is part of that leap year - so I am missing a step. And so it goes for the leap day - I have created the program to read that the 29th is a leap day but not exculsively to the month of february that falls in the leap year. Make sense? Here is my code so far:
Here are details of the assignment:
1.Prompt the user for a year using GUI dialogue window.
a.Remember to give the user clear direction on input requirements.
i.E.g. "Please enter month as integer 1-12:"
2.Prompt the user for the month using GUI dialogue window.
a.Remember to give the user clear direction on input requirements.
b.** Please note: month must be input as a string, and then converted to an integer for the case statement below. This may require 2 case statements.
3.Prompt the user for a day in the month.
a.This must return a message to the user if the month doesn’t include that day.
b.i.e. entering 30 in a February month should tell the user it is an invalid day and stop execution.
4.Check to see if the year is a leap year.
5.Check to see if the month is a leap month.
6.Check to see if the day is a leap day.
7.Display a user friendly back to the consumer indicating:
a.Year entered & If it is a leap year
b.Month entered & if it is a leap month.
c.The number of days in the month (e.g. January has 31 days, whereas February has 28 unless it is a leap year.
d.The day of the month entered & whether or not is a Leap day.
e.Output can be in three different dialogue windows, or just 1 if desired.
And here is my code - I am not sure what to do next. It is running and compiling without any errors right now but I know I am missing some steps. Any help or advice in what steps to take next would be appreciated!
import javax.swing.JOptionPane;
public class Leap_Year {
     public static void main (String[] args) {
     //Enter a year
     String enterYearString = JOptionPane.showInputDialog("Enter a year: ");
     //Convert year to an integer
     int enterYear = Integer.parseInt(enterYearString);
     // Check if year is a leap year
          boolean isLeapYear =
                    (enterYear % 4 == 0 && enterYear % 100 != 0) || (enterYear % 400 == 0);
     //Enter a month
          String enterMonthString = JOptionPane.showInputDialog("Enter a month as an integer, e.g. 1-12: ");
     //Convert month to an integer
     int enterMonth = Integer.parseInt(enterMonthString);     
     //Check if month is a leap year
               boolean isLeapMonth =
                         (enterMonth == 2);
     //Enter a day
               String enterDayString = JOptionPane.showInputDialog("Enter a Day as an integer, e.g. 1-31: ");
     //Convert day to an integer
          int enterDay = Integer.parseInt(enterDayString);     
     //Check if day is a leap day
                    boolean isLeapDay =
                              (enterDay == 29);          
     //Display the result
     String output = "The year " + enterYear + " is a leap year is: " + isLeapYear +
               "\nThe month " + enterMonth + " is a leap month is: " + isLeapMonth +
               "\nThe day " + enterDay + " is a leap day is: " + isLeapDay;
     JOptionPane.showMessageDialog(null,output);
}

Answer 1

Ok - so I may have "over-coded" - since I am totally new to programming this might be sloppy. Apologies ahead of time. I have most of the stuff figured out. A couple of problems I am having. When I display my results as to whether or not the month is a leapy year is reads as:
The year 2012 is a leap year is: true
The month of February in the year 2012 is a leap month is: true
How would I go about making it display something simple like:
The year 2012 is a leap year.
The month of February in the year 2012 is a leap year. OR
The year 2013 is not a leap year.
The month of January in the year 2013 is not a leap month.
Additionally, I need to write a case statement that would return an error statement if someone tried to enter the wrong number of days in a month (example entering 31 days for the month of February).
Here is my current code:
import javax.swing.JOptionPane;
public class LeapYear2 {
     public static void main (String[] args) {
     //Enter a year
     String enterYearString = JOptionPane.showInputDialog("Enter a year: ");
     //Convert year to an integer
     int enterYear = Integer.parseInt(enterYearString);
     // Check if year is a leap year
          boolean isLeapYear =
                    (enterYear % 4 == 0 && enterYear % 100 != 0) || (enterYear % 400 == 0);
     //Enter a month
          String enterMonthString = JOptionPane.showInputDialog("Enter a month as an integer, e.g. 1-12: ");
     //Convert month to an integer
     int enterMonth = Integer.parseInt(enterMonthString);     
     //Check if month is a leap year
               boolean isLeapMonth =
                         (enterMonth == 2 && enterYear % 4 == 0 && enterYear % 100 != 0) || (enterYear % 400 == 0);          
     //Enter a day
               String enterDayString = JOptionPane.showInputDialog("Enter a Day as an integer, e.g. 1-31: ");
     //Convert day to an integer
          int enterDay = Integer.parseInt(enterDayString);     
     //Check if day is a leap day
                    boolean isLeapDay =
                              (enterDay == 29 && enterMonth == 2 && enterYear % 4 == 0 && enterYear % 100 != 0) || (enterYear % 400 == 0);          
     //Set number of days to a variable
                    int numDays;
     //Calculate the number of days in a month                    
                    if (enterMonth == 2)
                         if (isLeapMonth)
                         numDays=29;
                    else
                         numDays = 28;
                    else if (enterMonth == 1 || enterMonth == 3 || enterMonth == 5 || enterMonth == 7 || enterMonth == 8 || enterMonth == 10 || enterMonth == 12)
                         numDays = 31;
                         else
                              numDays = 30;
     //Set the name of the month to a variable
                    String month = null;
     //Determine the number association to the name of the month
                    if (enterMonth == 1)
                         month = "January";
                    if (enterMonth == 2)
                         month = "February";
                    if (enterMonth == 3)
                         month = "March";
                    if (enterMonth == 4)
                         month = "April";
                    if (enterMonth == 5)
                         month = "May";
                    if (enterMonth == 6)
                         month = "June";
                    if (enterMonth == 7)
                         month = "July";
                    if (enterMonth == 8)
                         month = "August";
                    if (enterMonth == 9)
                         month = "September";
                    if (enterMonth == 10)
                         month = "October";
                    if (enterMonth == 11)
                         month = "November";
                    if (enterMonth == 12)
                         month = "December";
     //Display the result
     String output = "The year " + enterYear + " is a leap year is: " + isLeapYear + "." +
               "\nThe month of " + month + " in the year " + enterYear + " is a leap month is: " + isLeapMonth + "." +
               "\nThe day " + enterDay + " is a leap day is: " + isLeapDay + "." +
               "\nThe month of " + month + " in the year " + enterYear +" has " + numDays +" days in it.";
     JOptionPane.showMessageDialog(null,output);
}