This post explains how to use classes in Java to build objects and organize your code. Also learn: constructors, static methods, and more!

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.

Java's default constructor lets developers create instances of classes when an explicitly defined constructor does not exist. Here's how it works.

Newer JVM-compatible languages like Scala, Groovy, and JRuby are better suited to creating internal DSLs than the Java language itself. Find out why in this final article in Venkat Subramaniam's ...

Sealed classes in Java let developers limit the creation and use of subclasses and preserve the class hierarchy. Here is how sealed classes in Java work.