Wouldn’t it be nice if all Java classes that you use, including your own, lived up to their promises? In fact, wouldn’t it be nice if you actually knew exactly what a given class promises? If you ...

Twenty-three years ago, in his Design Principles and Design Patterns article, Robert "Uncle Bob" Martin boiled down the Liskov substitution principle to the idea that "derived classes should be ...

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. Abstract classes and ...