What are some examples of functional interfaces in Java?

What are some examples of functional interfaces in Java?

Functional interfaces in Java are interfaces with a single abstract method. Examples include Runnable, Callable, and Comparator.

Can you explain how the Comparator interface works?

Sure! The Comparator interface is used to compare two objects. It has a method called compare that takes two parameters and returns an integer.

What about the Runnable interface? How is it used?

The Runnable interface is designed for classes whose instances are intended to be executed by a thread. It has a single method, run, that contains the code to be executed.

Are there any built-in functional interfaces in Java 8?

Yes, Java 8 introduced several built-in functional interfaces like Function, Consumer, Supplier, and Predicate.