Swing Dialog Boxes --- Have no clue why its not working

Please help me with my source code.

import java.util.Scanner;

public class ParisProject
{
public static void main(String[]args)
{

// declare and construct variables
Scanner sc = new Scanner(System.in);
String date, year;
int day, month;
boolean leapYear;

// print prompts and get input
System.out.println("\tARE YOU BORN ON A LEAPYEAR?");
date=JOptionPane.showInputDialog(null,"Please enter your birthday in this format, mm/dd/yyyy.");
date = sc.nextLine();
day=JOptionPane.showInputDialog(null,"Please enter the day you were born on in this format, dd.");
day= Integer.parseInt(formatDay(date));
month=JOptionPane.showInputDialog(null,"Please enter the month you were born on in this format, mm.");
month= flag(formatMonth(date));
year=JOptionPane.showInputDialog(null,"Please enter the year you were born on in this format, yyyy.");
year=formatYear(date);

// calculations
leapYear=leapYear(date);

// output
JOptionPane.showMessageDialog(null,"It is "+leapYear+" that the year "+year+" is a leap year",JOptionPane.PLAIN_MESSAGE);

switch(month)
{
case 1:System.out.println("The date is: January "+day+", "+year); break;
case 2:if(day<=28){
System.out.println("The date is: February "+day+", "+year); }
break;
case 3:System.out.println("The date is: March "+day+", "+year); break;
case 4:System.out.println("The date is: April "+day+", "+year); break;
case 5:System.out.println("The date is: May "+day+", "+year); break;
case 6:System.out.println("The date is: June "+day+", "+year); break;
case 7:System.out.println("The date is: July "+day+", "+year); break;
case 8:System.out.println("The date is: August "+day+", "+year); break;
case 9:System.out.println("The date is: September "+day+", "+year); break;
case 10:System.out.println("The date is: October "+day+", "+year); break;
case 11:System.out.println("The date is: November "+day+", "+year); break;
case 12:System.out.println("The date is: December "+day+", "+year); break;
default: System.out.println("What planet are you living on with that kind of date? Please, try again!");
}





public static int formatMonth(String q)
{
String month = q.substring(0,2);
int m = flag(Integer.parseInt(month));
return m;
}

public static int flag(int month)
{
if(month==1)
month=1;
if(month==2)
month=2;
if(month==3)
month=3;
if(month==4)
month=4;
if(month==5)
month=5;
if(month==6)
month=6;
if(month==7)
month=7;
if(month==8)
month=8;
if(month==9)
month=9;
if(month==10)
month=10;
if(month==11)
month=11;
if(month==12)
month=12;
return month;
}




public static String formatYear(String q)
{
String year;
year = q.substring(6,10);
return year;
}




public static boolean leapYear(String q)
{
String year=q.substring(6,10);
int leap=Integer.parseInt(year);
{
if ((leap%4)==0 && (leap%100)!=0)
return true;
if ((leap%4)==0&&(leap%100)==0&&(leap%400)==0)
return true;
else
return false;
}



}
}

When posting code, make sure you use the code tags to preserve formatting.

What does "not working" mean?

It was running until i tried using swing Dialog boxes in my source code. So, now its not compling which means it still needs debugging.. but I do not know where I went wrong? or how to get it to work with the swing dialog boxes. Please help!

Code Java:

---

import java.util.Scanner;
 
public class ParisProject
{
  public static void main(String[]args)
  {
 
      // declare and construct variables
      String date, year;
      int day, month;
      boolean leapYear;
 
      // print prompts and get input
      System.out.println("\tARE YOU BORN ON A LEAPYEAR?");
      date=JOptionPane.showInputDialog(null,"Please enter your birthday in this format, mm/dd/yyyy.");
          date = sc.nextLine();
      day=JOptionPane.showInputDialog(null,"Please enter the day you were born on in this format, dd.");
          day= Integer.parseInt(formatDay(date));
      month=JOptionPane.showInputDialog(null,"Please enter the month you were born on in this format, mm.");
          month= flag(formatMonth(date));
      year=JOptionPane.showInputDialog(null,"Please enter the year you were born on in this format, yyyy.");
          year=formatYear(date);
 
      // calculations
      Scanner sc = new Scanner(System.in);
      leapYear=leapYear(date);
 
      // output
      JOptionPane.showMessageDialog(null,"It is "+leapYear+" that the year "+year+" is a leap year",JOptionPane.PLAIN_MESSAGE);
 
 
switch(month)
{
      case 1:System.out.println("The date is: January "+day+", "+year); break;
  case 2:if(day<=28){
    System.out.println("The date is: February "+day+", "+year); }
        break;
      case 3:System.out.println("The date is: March "+day+", "+year); break;
      case 4:System.out.println("The date is: April "+day+", "+year); break;
      case 5:System.out.println("The date is: May "+day+", "+year); break;
      case 6:System.out.println("The date is: June "+day+", "+year); break;
      case 7:System.out.println("The date is: July "+day+", "+year); break;
      case 8:System.out.println("The date is: August "+day+", "+year); break;
      case 9:System.out.println("The date is: September "+day+", "+year); break;
      case 10:System.out.println("The date is: October "+day+", "+year); break;
      case 11:System.out.println("The date is: November "+day+", "+year); break;
      case 12:System.out.println("The date is: December "+day+", "+year); break;
      default: System.out.println("What planet are you living on with that kind of date? Please, try again!");
}
 
 
 
 
 
public static int formatMonth(String q)
{
String month = q.substring(0,2);
int m = flag(Integer.parseInt(month));
return m;
}
 
 public static int flag(int month)
    {
      if(month==1)
        month=1;
         if(month==2)
        month=2;
         if(month==3)
        month=3;
         if(month==4)
        month=4;
        if(month==5)
        month=5;
        if(month==6)
        month=6;
        if(month==7)
        month=7;
        if(month==8)
        month=8;
        if(month==9)
        month=9;
        if(month==10)
        month=10;
        if(month==11)
        month=11;
        if(month==12)
        month=12;
        return month;
  }
 
 
 
 
public static String formatYear(String q)
{
String year;
year = q.substring(6,10);
return year;
}
 
 
 
 
public static boolean leapYear(String q)
{
String year=q.substring(6,10);
int leap=Integer.parseInt(year);
{
if ((leap%4)==0 && (leap%100)!=0)
  return true;
if ((leap%4)==0&&(leap%100)==0&&(leap%400)==0)
  return true;
else
  return false;
}
 
 
 
}
}

---

By default, the value the user inputted is a String. You are first setting the int day to a String value.

Your showMessageDialog

JOptionPane.showMessageDialog(null,"It is "+leapYear+" that the year "+year+" is a leap year",JOptionPane.PLAIN_MESSAGE);

Doesn't have the correct parameters required for that method.

Also, you never defined the method formatDay.

date=JOptionPane.showInputDialog(null,"Please enter your birthday in this format, mm/dd/yyyy.");
date = sc.nextLine();

No.

They enter it in the dialog box. You don't need to get it from the console.

I got it to compile, though it probably doesn't work correctly as I had to change some things around.

Code java:

---

 
import java.util.Scanner;
 
import javax.swing.JOptionPane;
 
public class ParisProject
{
  public static void main(String[]args)
  {
 
      // declare and construct variables
      String date, year, day2, month2, year2;
      int day, month;
      boolean leapYear;
 
      // print prompts and get input
      System.out.println("\tARE YOU BORN ON A LEAPYEAR?");
      date=JOptionPane.showInputDialog(null,"Please enter your birthday in this format, mm/dd/yyyy.","ARE YOU BORN ON A LEAPYEAR?", JOptionPane.PLAIN_MESSAGE );
         //  date = sc.nextLine();
      day2=JOptionPane.showInputDialog(null,"Please enter the day you were born on in this format, dd.");
          day= Integer.parseInt((day2));
      month2=JOptionPane.showInputDialog(null,"Please enter the month you were born on in this format, mm.");
          month= flag(formatMonth(date));
      year=JOptionPane.showInputDialog(null,"Please enter the year you were born on in this format, yyyy.");
          year=formatYear(date);
 
      // calculations
      Scanner sc = new Scanner(System.in);
      leapYear=leapYear(date);
 
      // output
      JOptionPane.showMessageDialog(null,"It is "+leapYear+" that the year "+year+" is a leap year", "Huh?", JOptionPane.PLAIN_MESSAGE);
 
 
switch(month)
{
      case 1:System.out.println("The date is: January "+day+", "+year); break;
  case 2:if(day<=28){
    System.out.println("The date is: February "+day+", "+year); }
        break;
      case 3:JOptionPane.showMessageDialog(null, "The date is: March "+day+", "+year, "Title", JOptionPane.INFORMATION_MESSAGE); break;
      case 4:
    	  System.out.println("The date is: April "+day+", "+year); break;
      case 5:System.out.println("The date is: May "+day+", "+year); break;
      case 6:System.out.println("The date is: June "+day+", "+year); break;
      case 7:System.out.println("The date is: July "+day+", "+year); break;
      case 8:System.out.println("The date is: August "+day+", "+year); break;
      case 9:System.out.println("The date is: September "+day+", "+year); break;
      case 10:System.out.println("The date is: October "+day+", "+year); break;
      case 11:System.out.println("The date is: November "+day+", "+year); break;
      case 12:System.out.println("The date is: December "+day+", "+year); break;
      default: System.out.println("What planet are you living on with that kind of date? Please, try again!");}
}
 
 
 
 
 
public static int formatMonth(String q)
{
String month = q.substring(0,2);
int m = flag(Integer.parseInt(month));
return m;
}
 
 public static int flag(int month)
    {
      if(month==1)
        month=1;
         if(month==2)
        month=2;
         if(month==3)
        month=3;
         if(month==4)
        month=4;
        if(month==5)
        month=5;
        if(month==6)
        month=6;
        if(month==7)
        month=7;
        if(month==8)
        month=8;
        if(month==9)
        month=9;
        if(month==10)
        month=10;
        if(month==11)
        month=11;
        if(month==12)
        month=12;
        return month;
  }
 
 
 
 
public static String formatYear(String q)
{
String year;
year = q.substring(6,10);
return year;
}
 
 
 
 
public static boolean leapYear(String q)
{
String year=q.substring(6,10);
int leap=Integer.parseInt(year);
{
if ((leap%4)==0 && (leap%100)!=0)
  return true;
if ((leap%4)==0&&(leap%100)==0&&(leap%400)==0)
  return true;
else
  return false;
}
 
 
 
}
}

---

Well, it looks like it's working so far.

It's very picky with the format.

Thanks for helping me! I appreciate it!