How to write a program in Java that calculates the difference between 2 user input dates?

Question:

How to write a program in Java that calculates the difference between 2 user input dates?

Code:

import java.util.*;
import java.text.*;
 
public class CompareDates {
   public static void main( String[] args ) {
 
      Scanner sc = new Scanner(System.in);
 
      System.out.print("Enter date1 (yyyy-MM-dd): ");
      String d1 = sc.nextLine();
 
      System.out.print("Enter date2 (yyyy-MM-dd): ");
      String d2 = sc.nextLine();
 
      try {
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
         Date date1 = sdf.parse(d1);
         Date date2 = sdf.parse(d2);
 
         System.out.println("Date1: " + sdf.format(date1));
         System.out.println("Date2: " + sdf.format(date2));
 
         long diff = date1.getTime() - date2.getTime();
         diff = diff / (1000L*60L*60L*24L);
         System.out.println("Delta: " + diff + " days");
 
      } catch(ParseException ex) {
      }
   }
}

Output:

$ java CompareDates
Enter date1 (yyyy-MM-dd): 2000-11-11
Enter date2 (yyyy-MM-dd): 2000-10-11
Date1: 2000-11-11
Date2: 2000-10-11
Delta: 31 days