Exercise 3. Write a program that prints the BillingDate which set every 5th day of the month. The program will prompt the user of the next billing date. (Use Java)

Exercise 4. Modify exercise 3 by applying the JOptionPane to display the output in a dialog box.

Include in the code the following:

import javax.swing.JOptionPane;

and replace the System.out.println() statement with

JOptionPane.showMessageDialog(null, + );