Learn the difference between classes and interfaces once and for all, then get started declaring, implementing, ... For example, Cloneable (see Inheritance in Java, Part 2) ...

We will focus on the relationship between polymorphism and Java inheritance. The main thing to keep in mind is that polymorphism requires an inheritance or an interface implementation. You can see ...

The key difference, however, is that when the Predicate interface runs, a true or false value must be returned. Here is a lambda expression and Predicate example: Predicate<Integer> lambdaPredicate = ...