In Java, nested classes are categorized as either static member classes or inner classes. Inner classes are non-static member classes, local classes, or anonymous classes.

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 ...

It is probably safe to assume that the majority of people who use JAXB today use the xjc compiler to create Java classes from XML Schema files rather than from Document Type Definition ( DTD ) files.