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.

In Java, while a class cannot extend multiple classes, it can implement multiple interfaces using the 'implements' keyword. When a class implements these interfaces, it must provide ...

public final class StockTransaction extends Transaction { } How sealed classes work. The key concept with sealed classes is that they are declared using the sealed keyword, followed by the permits ...