Functional Programming in Java

Overview

Functional Programming (FP) in Java introduces a paradigm shift from imperative to declarative programming, emphasizing immutability, pure functions, and higher-order functions. This section covers advanced FP concepts and their practical applications in enterprise Java development.

What You'll Learn

• Advanced Stream operations and patterns
• Effective use of Lambda expressions
• Working with Optional for null safety
• Functional interfaces and their applications
• Immutability and pure functions
• Composition and higher-order functions

Prerequisites

• Solid understanding of Java basics
• Experience with Java collections
• Basic understanding of Object-Oriented Programming

Key Concepts

1. Immutability

   • Thread safety
   • Predictable behavior
   • Side-effect free code

2. Pure Functions

   • Deterministic results
   • No side effects
   • Referential transparency

3. Higher-Order Functions

   • Functions as parameters
   • Functions returning functions
   • Function composition

4. Stream Processing

   • Lazy evaluation
   • Parallel processing
   • Pipeline operations

Why Functional Programming?

• Cleaner, more maintainable code
• Better support for concurrent programming
• Reduced bugs through immutability
• Improved testability
• More expressive code

Module Structure

1. Introduction

   • Basic concepts
   • Functional interfaces
   • Pure functions

2. Streams

   • Advanced operations
   • Custom collectors
   • Parallel processing

3. Lambda Expressions

   • Method references
   • Closure scope
   • Best practices

4. Optional

   • Null safety
   • Monadic operations
   • Best practices

Getting Started

Start with the introduction and progress through each topic sequentially for the best learning experience.