The first half of this introduction to Java inheritance teaches you how to use the extends keyword to derive a child class from a parent class, invoke parent class constructors and methods ...

Here's how it works. Use sealed classes in Java to control your inheritance Need to limit the number of possible subclasses in your codebase? Here comes Java's sealed classes to your rescue. Advanced ...

An interface can never have a state, so it cannot use mutable instance ... the fact that multiple inheritance (extending more than one class) can cause code deadlocks. Java’s engineers decided ...