Question

import chapter6.date.SimpleDate;
import java.util.Scanner;

public class SimpleDateTestDefault {
public static void main(String[] args) {
Scanner stdin = new Scanner(System.in);
SimpleDate d1 = new SimpleDate();
SimpleDate d2 = new SimpleDate(stdin.nextInt(), stdin.nextInt(), stdin.nextInt());
System.out.println(d1);
System.out.println(d2);
System.out.println(d1.before(d2));
System.out.println(d2.before(d1));
}
}

Implement SimpleDate class in chapter6.date package with the following attributes:

1. day, (int type,  private)
2. month, (int type,  private)
3. year (int type,  private)

The class should have the following methods:

1. a constructor with three parameters: year, month, and day
2. a constructor with no parameters which initialize the date to 01/01/2000
3. boolean before(SimpleDate another)
4. int numOfDays(SimpleDate another), the number of days from this date to another. If another is later than this date, return a positive value, return 0 if equals, and return a negative value if another is before this date.
5. String toString(): return the String representation in mm/dd/yyyy format.

Answer 1

Code to copy along with screenshots of code and output are provided.
Please refer to screenshots to understand the indentation of code.
If you have any doubts or issues. Feel free to ask in comments
Please give this answer a like, or upvote. This will be very helpful for me.
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Screenshots of "SimpleData.java":

Screenshots of "SimpleDateTestDefault.java"

Screenshots of Output :

Code to copy("SimpleDate.java"):

import java.util.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;

public class SimpleDate {

   // integer variables
   int day;
   int month;
   int year;
  
   // constructor which takes three integer arguments
   SimpleDate(int day, int month, int year)
   {
      
   // initializing varaible according to arguments
   this.day = day;
   this.month = month;
   this.year = year;
     
   }
  
   // constructor with no parameters
   SimpleDate()
   {
       // initializing with default values
       this.day = 01;
       this.month = 01;
       this.year = 2000;
   }
  
   // method to return number of days from this to another
   int numberOfDays(SimpleDate another)
   {
       int n = 0;
      
       // creating date strings of SimpleDate
       String dateString = Integer.toString(this.month) + "/"+Integer.toString(this.day)+ "/"+Integer.toString(this.year);
   String date2String = Integer.toString(another.month) + "/"+Integer.toString(another.day)+ "/"+Integer.toString(another.year);
  
   // format of date
   String format = "MM/dd/yyyy";
  
   // new SimpleDateFormat object
   SimpleDateFormat sDateFormat = new SimpleDateFormat(format);
  
   try
   {
           // parsing dateString as into Date
       Date d1 = sDateFormat.parse(dateString);
      
       //parsing date2String as into Date
       Date d2 = sDateFormat.parse(date2String);
         
// calculating difference of days using getTime function          
       n = (int) (((d2.getTime()-d1.getTime())/(1000*60*60*24)));
       }
   catch (ParseException e)
   {
       // try catch to catch parsing exception
      
       }
      
       // return number of days
       return n;
   }
  
  
   // method to check if date is before another date
   boolean before(SimpleDate another)
   {
   boolean ret = false;  
      
   // if numberOfDays is positive then another date is after this date
   if(numberOfDays(another) > 0)
   {
   ret = true;  
   }
  
  
   // return
   return ret;
   }
  
   // method to convert this date to string
   public String toString()
   {
       // returning string
       return Integer.toString(this.month)+"/"+Integer.toString(this.day)+"/"+Integer.toString(this.year);
   }

}

Code to copy("SimpleDateTestDefault.java"):

import java.util.Scanner;

public class SimpleDateTestDefault {
  
  
   public static void main(String args[])
  
   {
  
  
   Scanner stdin = new Scanner(System.in);
  
   // creating SimpleDate instance using default values
   SimpleDate d1 = new SimpleDate();
  
  
   System.out.print("Enter day month and year : ");
  
   // creating SimpleDate instance using values entered by user
   SimpleDate d2 = new SimpleDate(stdin.nextInt(), stdin.nextInt(), stdin.nextInt());
  
   // converting date to strings
   System.out.println("d1: "+d1.toString());
   System.out.println("d2: "+d2.toString());
  
   // checking before(SimpleDate) function
   System.out.println("Is d1 before d2?: "+d1.before(d2));
   System.out.println("Is d2 before d1?: "+d2.before(d1));
  
   //checking numberOfDays(SimpleDate another) function
   System.out.print("Number of days between(d2 - d1):"+d1.numberOfDays(d2));
  
   }
  
}

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