Learn the difference between classes and interfaces once and for all, then get started declaring, implementing, and extending interfaces in your Java programs ...

Why does Java's standard class library contain empty interfaces like Cloneable and Serializable? Find out why in this sixth installment in the "Object-oriented language basics" series. You'll also ...

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 = ...