#9 - Java 8 - Functional Interfaces Practice Java 8 #java #functionalinterface

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In this video we'll see what are functional interfaces and also see few built in functional interfaces provided in Java 8. This session is mainly Practice Session with examples of all the discussed Functional Interface.

0:00 Introduction
0:29 Predicate Functional Interface : To check if a number is even
3:05 Function Functional Interface : To double a number
4:30 UnaryOperator Functional Interface : Update a value
6:20 BinaryOperator Functional Interface : Multiply two numbers
8:00 Supplier Functional Interface : Supply current LocalDateTime value
9:56 Consumer Functional Interface : Consume a list and print its contents

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Functional interfaces are included in Java SE 8 with Lambda expressions and Method references in order to make code more readable, clean, and straightforward. Functional interfaces are interfaces that ensure that they include precisely only one abstract method. Functional interfaces are used and executed by representing the interface with an annotation called @FunctionalInterface. As described earlier, functional interfaces can contain only one abstract method. However, they can include any quantity of default and static methods.

In Functional interfaces, there is no need to use the abstract keyword as it is optional to use the abstract keyword because, by default, the method defined inside the interface is abstract only. We can also call Lambda expressions as the instance of functional interface.

Before Java 8, we had to create anonymous inner class objects or implement these interfaces.

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