Question

Build a java program to validate a date in the future as entered by the user at the keyboard as three separate integer values:

mm

dd

yyy

Acceptable data criteria:

1. mm: month in range of 1-12

2. dd: day in range of 1-30 for April, June. September, & Nov. / 1-31 January, March, May, July, August, October, & December. Only accept 1-28 for February at this point.

3. yyy: current year (as long as the month and day have yet to occur), or any future year.

Note: Make sure your prompts and displayed outcomes will be to the screen and should be user friendly, including directions that the date to choose is in the future. Input is from the keyboard.

Answer 1

here i have create validate_date class and implement the program

code for validate_date:

package validate_date;

import java.util.Scanner;

public class Validate_date
{

public static void main(String[] args)
{
Scanner sc=new Scanner(System.in);//scanner object for user input
int dd;
int mm;
int yyy;//three inputs
System.out.println("Enter Day: ");
dd = sc.nextInt();
System.out.println("Enter Month");
mm = sc.nextInt();
System.out.println("Enter Year");
yyy = sc.nextInt();//three user input and store value in mm dd and yyy as per your requirment
System.out.print(+dd);
System.out.print("/");// date separator
System.out.print(+mm);
System.out.print("/");// date separator
System.out.print(+yyy);

boolean Date_True = true;//boolean variable Date_True
if(mm > 12)
{
Date_True = false;//false if month is invalid
}
else if (mm == 1 || mm == 3 || mm == 5 || mm == 7 || mm == 8 || mm == 10 || mm == 12)//check month for 31 date
{
if (dd <= 31)
{   
Date_True = true;
}
else if (dd >= 31)
{
Date_True = false;
}
}
else if (mm == 4 || mm == 6 || mm == 9 || mm == 11)//check month for 30 date
{
if (dd <= 30)
{
Date_True = true;
}
else if (dd >= 30)
{
Date_True = false;
}

}
else if (mm == 2) // month check of February
{
if (yyy % 4 == 0) // check it is Leap year or not for february
{
if (dd <= 29)
{
Date_True = true;
}
else if (dd >= 29)
{
Date_True = false;
}
}
else if (yyy % 4 != 0)
{
if (dd <= 28)
{
Date_True = true;
}
else if (dd >= 28)
{
Date_True = false;
}
}
}
if(Date_True)//check date is valid or invalid
{
System.out.println("\n Valid Date");
}
if(!Date_True)
{
System.out.println("\n Invalid Date");
}
}
}

Output

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