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.

At JavaZone 2010 I will be giving a lightning talk on APIs that use dynamic subclasses. These APIs make it possible to do things in Java that seem like pure magic. Here are some ideas of what you ...

Learn the four types of polymorphism in Java, then start using subtype polymorphism to execute different forms of the same Java method.