Abstract classes and interfaces in Java serve fundamentally different purposes. Learn the differences between these Java language elements and how to use them in your programs.

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 ...

However, Java arrays do not have a size() method, nor do they have a length() method. Instead, the property length provides a Java array’s size. To further confuse matters, every Java collection class ...