You don’t have to create any Book objects to call class ... belongs to the same package (discussed later in the Java 101 series) as the class containing the member that is to be accessed.

Maximizing code reuse in your Java programs means writing ... Factory method: Defines an interface for creating objects, but lets subclasses decide which class to instantiate.

You must create a timer class instance to use the timer's functions. Add the following code to the Java file:timer = new Timer(countdown, this);Notice the "countdown" variable is used. This ...

To effectively use Unified Modeling Language when developing Java applications, developers must have a thorough understanding of the UML elements and how these elements map to Java. To effectively ...