To extend your knowledge of the subjects covered today, try the following exercises:
Create a program that turns a birthday in MM/DD/YYYY format (such as 12/04/2003) into three individual strings.
Create a class with instance variables for height, weight, and depth, making each an integer. Create a Java application that uses your new class, sets each of these values in an object, and displays the values.
Where applicable, exercise solutions are offered on the book's Web site at http://www.java21days.com.