In Java, nested classes are categorized as either static member classes or inner classes. ... The first line instantiates JButton, passing close as the button label to JButton‘s constructor.

Classes, fields, methods, constructors, and objects are the building blocks of object-based Java applications. This Java tutorial teaches you how to declare classes, describe attributes via fields ...

Sealed classes make Java an even more powerful and expressive language and set the stage for even more sophisticated techniques such as pattern matching, which we'll explore in a subsequent article. A ...