#8 - Java 8 - Functional Interfaces Theory Java 8
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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 theory and in upcoming session we'll work on the examples of all the discussed Functional Interface.
0:00 Introduction
0:40 What is a Functional Interface?
1:46 @FunctionalInterface Annotation
2:26 Why do we need Lambda Expressions for Functional Interfaces?
3:09 Legacy Functional Interfaces in Java
3:38 List of Important Built in Functional Interfaces in Java 8
3:56 Function Functional Interface
4:28 Predicate Functional Interface
4:42 UnaryOperator Functional Interface
5:18 BinaryOperator Functional Interface
5:50 Supplier Functional Interface
6:08 Consumer Functional Interface
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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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