22. Lambda Expressions and Functional Interfaces
Lambda expressions and functional interfaces in Java greatly enhance the language's functional programming capabilities, allowing for concise and expressive code. These features facilitate the use of Streams, Collections, and multithreading, promoting improved code reusability and flexibility. Understanding the syntax, characteristics, and best practices surrounding lambda expressions equips developers with essential tools for modern Java programming.
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What we have learnt
- Lambda expressions allow the creation of anonymous functions in Java.
- Functional interfaces are integral to lambda expressions, each having a single abstract method.
- Java 8 introduced a collection of built-in functional interfaces and methods for easier functional programming.
Key Concepts
- -- Lambda Expression
- An anonymous function that can be passed around and executed, represented as (parameters) -> expression.
- -- Functional Interface
- An interface with exactly one abstract method which can be implemented by lambda expressions.
- -- Functional Programming
- A programming paradigm emphasizing pure functions, immutability, and statelessness.
- -- Method Reference
- A shorthand notation for calling a method with a lambda expression, using the syntax ClassName::methodName.
- -- Stream API
- An API that allows functional-style operations on streams of elements, making data manipulation easier.
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