This example also shows a misbehaving toString() implementation in the subclass. If we extend the Fraction class and mark the methods we don’t want overridden with final, there could be ...

Java does enable the option to mark a class as final to eliminate the ability to perform inheritance complete, but that is often too heavy of a hammer to drop. Marking a class as final prevents all ...

The release of Java SE 15 in Sept 2020 will introduce "sealed classes" (JEP 360) as a preview feature. A sealed class is a class or interface which restricts which other classes or interfaces may ...