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 ...

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.

This works because the two are closely related. In Java, nested classes are categorized as either static member classes or inner classes. Inner classes are non-static member classes, local classes ...

The single responsibility principle in Java demands that a class serves a single ... to easily refactor the code and fix the single responsibility principle violation, just create a new class ...