Here's how to make classes, fields, methods, constructors, and objects work together in your Java programs.

I often find that if I need a parameter object simply for passing information between methods and constructors in the same package that it can be useful to make these parameter object classes ...

Reference objects aren't just useful when memory is at a premium; they can also be used to provide slick caching abilities to any application.

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.