Question

Write a java program

Problem 4

involves a date in the form of mm/dd/yyyy. You must write a java program that checks if a date is valid or not , make sure that the program tells you where the error is in the program if there is one . I want you to work with characters and the switch statement, and write out a reason for each incorrect input value. .

Answer 1

================================ java code for validation of the given format is===================

import java.util.Scanner;

public class Main
{
public static void main (String[]args)
{
Scanner sc = new Scanner (System.in);
// extractin out day month and year part separately
System.out.println ("Enter the date format{mm/dd/yyyy}:");
String date = sc.next ();
String dateArray[] = date.split ("/");
int month = 0;
int day = 0;
int year = 0;
//looping for validating each part
for (int i = 0; i < 3; i++)
{

   switch (i)
   {
   case 0:
   // month lenth validating
   if (dateArray[0].length () != 2)
   {
       System.out.println ("Error in date-month part length");
       System.exit (0);

   }

   try
   {

   int first = Character.getNumericValue (dateArray[0].charAt (0));
   int second =
       Character.getNumericValue (dateArray[0].charAt (1));
   month = first * 10 + second;

   } catch (Exception e)
   {
   // month correct digit validating
   System.out.
       println ("month should be a two digit number not character");
   System.exit (0);
   }
   break;
   case 1:
   //day length validating
   if (dateArray[1].length () != 2)
   {
       System.out.println ("Error in date-day part length!");
       System.exit (0);

   }

   try
   {

   int first = Character.getNumericValue (dateArray[1].charAt (0));
   int second =
       Character.getNumericValue (dateArray[1].charAt (1));
   day = first * 10 + second;
   //day high range validating
   int highRange = 0;
   switch (month)
       {
       case 1:
       highRange = 31;
       break;
       case 2:
       highRange = 28;
       break;
       case 3:
       highRange = 31;
       break;
       case 4:
       highRange = 30;
       break;
       case 5:
       highRange = 31;
       break;
       case 6:
       highRange = 30;
       break;
       case 7:
       highRange = 31;
       break;
       case 8:
       highRange = 31;
       break;
       case 9:
       highRange = 30;
       break;
       case 10:
       highRange = 31;
       break;
       case 11:
       highRange = 30;
       break;
       case 12:
       highRange = 31;
       break;
       default:
       System.out.println ("Month should be between 1-12");
       System.exit (0);

       }

   //validating day highRange
   if (day < 0 || day > highRange)
       {
       System.out.println ("Error in day range --");
       }
   else
       {
       System.out.println ("Day is correct!--");
       }

   }
   catch (Exception e)
   {
   //validating if day is character or digit
   System.out.
       println ("day should be a two digit number not character");
   System.exit (0);
   }
   break;
   case 2:
   //year length validating
   if (dateArray[2].length () != 4)
   {
       System.out.println ("Error in date-year part length!");
       System.exit (0);

   }
   try
   {

   int first = Character.getNumericValue (dateArray[2].charAt (0));
   int second =
       Character.getNumericValue (dateArray[2].charAt (1));

   int third = Character.getNumericValue (dateArray[2].charAt (2));
   int fourth =
       Character.getNumericValue (dateArray[2].charAt (3));
   //leap year validating
   year = first * 1000 + second * 100 + third * 10 + fourth;
   if (year % 4 == 0 || (year % 100 == 0 && year % 400 == 0))
       {
       if (month == 2 && day > 29)
       {
       System.out.println ("In leap year february is of 29--");
       System.exit (0);
       }
       else
       {
       System.out.println ("Month part is correct!");
       }

       }
   else
       {
       System.out.println ("Month part is Correct!");
       }

   System.out.
       println ("Yearis correct \n Date is in correct format!");

   }
   catch (Exception e)
   {
   System.out.
       println ("year should be a number not characters or string!");
   System.exit (0);

   }

   break;
   }
}
}
}

-------------------------------------------------------------------------------------------------------------------------------------------------------

Screenshots of the code and the output:

------------------------------------------------------------------------------------------------------------------------------------------------------

================================ end=========================================

*************** please like the post it motivates me****************************************************