The first half of this tutorial introduced the basics of inheritance in Java. You learned how to use Java’s extends and super keywords to derive a child class from a parent class, invoke parent ...

Polymorphism and Java inheritance; ... a subclass of the return type. Here’s an example: ... the time in the core Java classes. One very simple example is when we instantiate the ArrayList class ...

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 ...