Java 8 Functional Interface Tutorial | Predicate, Function, Consumer, Supplier
Functional Interfaces in Java 8 are the foundation of Lambda Expressions and modern Java functional programming. In this video, we understand what a functional interface in Java 8 is, why it is used, and how it enables lambda expressions.
We start by learning how to write and simplify Java lambda expressions, and then move into the most commonly used Java functional interfaces with clear coding examples.
The video focuses on the abstract methods and real use cases of the core functional interfaces in Java:
• Predicate Interface in Java 8 → test() method
Used when you need to evaluate a condition and return a boolean.
• Function Interface in Java 8 → apply() method
Used when you need to take an input and transform it into an output.
• Consumer Interface in Java 8 → accept() method
Used when you consume input and perform an operation without returning a value.
• Supplier Interface in Java 8 → get() method
Used when you supply or generate a value without taking any input.
For each interface, we explore:
✔ The abstract method it defines
✔ Input and output behavior
✔ When to use it in real scenarios
✔ Multiple Java lambda expression examples
If you want to clearly understand Predicate, Function, Consumer, and Supplier in Java 8 along with their methods test(), apply(), accept(), and get(), this video will make the concepts easy to grasp.
Perfect for Java developers, beginners learning Java 8 features, and interview preparation.
00:00 : Introduction
00:42 : Functional Interface & Lambda Expressions
04:16 : Predicate Functional Interface
05:01 : Predicate Functional Interface Example 1
07:45 : Predicate Functional Interface Example 2
10:29 : Function Functional Interface
11:11 : Function Functional Interface Example 1
12:48 : Function Functional Interface Example 2
14:12 : Consumer Functional Interface
14:43 : Consumer Functional Interface Example 1
15:39 : Consumer Functional Interface Example 2
16:42 : Supplier Functional Interface
17:22 : Supplier Functional Interface Example 1
18:28 : Supplier Functional Interface Example 2
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