Functional Interface in Java 8 | Java 8 Features | Crash Course ✅

In this crash course, you will learn what is a functional interface and how to use Lambda expressions to implement functional interfaces.
An Interface that contains exactly one abstract method is known as a functional interface.
It can have any number of default, static methods but can contain only one abstract method. It can also declare the methods of the object class.
Functional Interface is also known as Single Abstract Method Interfaces or SAM Interfaces. It is a new feature in Java 8, which helps to achieve a functional programming approach.
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