Functional Java: Master Java Lambdas And Streams

Functional Java Mastery: Lambdas, Streams, Immutability, and Composability

What you'll learn

Understand core functional principles and how they differ from OOP.

Define pure vs. impure functions and why they matter for clean code.

Leverage lambdas to treat behavior as data and reduce boilerplate.

Explore functional interfaces, from custom to built-in JDK solutions.

Simplify code using method references for concise function delegation.

Compose multiple lambdas using andThen, compose, and higher-order patterns.

Learn closures, handle captured variables, and maintain immutability.

Embrace Java Streams for declarative, lazy, and efficient data processing.

Apply filter, map, limit, and more to build powerful stream pipelines.

Sort, distinct, and merge streams while preserving performance and safety.

Debug with peek, ensuring transparency in stream transformations.

Harness parallel processing effortlessly with the Streams API.

Master concurrency and immutability to write robust, scalable code.

Integrate functional concepts with OOP to create flexible architectures.

Craft testable, composable solutions that are easy to maintain and extend.

Requirements

Basic Java knowledge (syntax, OOP concepts)

A working Java Development Kit (JDK)

Familiarity with an IDE (e.g., IntelliJ, Eclipse)

Ability to compile and run Java programs

Description

Elevate your Java expertise with this all-inclusive dive into functional programming in Java, meticulously designed to help you code with greater clarity, efficiency, and reliability. In this course, you’ll discover how lambdas transform your approach to problem-solving by allowing you to treat behavior as data—enabling everything from concise callbacks to powerful, composable functions. You’ll explore JDK functional interfaces like Function, Consumer, and Supplier to streamline code, reduce boilerplate, and write more testable software. We’ll also unpack the intricacies of method references, showing you how to simplify your syntax and let the JVM handle the heavy lifting.Beyond the basics, this curriculum covers closures and effectively final variables, ensuring you grasp how data is captured and controlled inside lambdas. Immutability will be spotlighted for writing robust, thread-safe functions, paving the way for parallel streams and improved performance across multi-core systems. You’ll learn to master the Streams API for declarative data processing—leveraging operations like map, filter, limit, distinct, and sorted for readable, concise transformations. We’ll go one step further with advanced operators like peek for debugging, composition methods such as andThen and compose, plus real-world advice on when and how to best harness parallel streams.For programmers preparing for job interviews, this course integrates problem-solving strategies to confidently tackle coding questions on lambdas, pure functions, and stream manipulation. You’ll gain practical experience writing clean, functional-style code that stands out in technical assessments. By the end, you’ll have the in-depth knowledge to seamlessly blend functional paradigms with object-oriented design—an invaluable skill for creating modern, scalable Java applications and impressing potential employers.

Overview

Section 1: Introduction to Functional Java

Lecture 1 Functional Programming In Java

Lecture 2 What Is Functional Programming?

Lecture 3 Functions Vs Methods

Lecture 4 Limitations Of Object Oriented Programming

Lecture 5 First Class Functions

Section 2: Delving into Lambda Expressions

Lecture 6 Introducing Lambda Expressions

Lecture 7 Lambda Expression Examples

Lecture 8 Recommendation And Q&A

Lecture 9 Functional Interfaces

Lecture 10 Typing Lambdas With Interfaces

Lecture 11 Why Single Abstract Method

Lecture 12 Lambda Hands-On Coding

Section 3: Interfaces and Functional Typing

Lecture 13 Interface Typing, Not SAM Typing

Lecture 14 Revisiting The Task Example With Lambdas

Lecture 15 The Functional Interface Annotation

Lecture 16 Lambda Code Demo

Lecture 17 Lambdas Vs Anonymous Classes

Lecture 18 The Interface Overhead Of Lambdas

Section 4: Key Functional Interfaces in Java

Lecture 19 JDK Functional Interfaces

Lecture 20 The Function Interface

Lecture 21 Consumer, Supplier, And Predicate

Lecture 22 JDK Functional Interfaces Hands-On

Lecture 23 Function Arity

Lecture 24 Operator Interfaces

Section 5: Method References

Lecture 25 Method References

Lecture 26 Method Reference Examples

Lecture 27 Method References Hands-On

Section 6: Advanced Functional Concepts

Lecture 28 Lambda Calling Lambdas Calling Lambdas

Lecture 29 Composability With AndThen And Compose

Lecture 30 Closures In Java

Lecture 31 Pure Functions

Section 7: Stream API Essentials

Lecture 32 What Are Streams?

Lecture 33 Declarative Model

Lecture 34 Stream API Characteristics

Lecture 35 The Assembly Line Analogy

Lecture 36 Streams Code Demo

Lecture 37 Other Ways To Create Streams

Lecture 38 The ToList Method

Lecture 39 Three Key Elements In Streams API

Section 8: Stream Operations and Manipulations

Lecture 40 Streams Vs Collections

Lecture 41 Limit And Filter Operators

Lecture 42 The Map Operator

Lecture 43 The Peek Operator And Debugging

Lecture 44 The Effect Of Terminal Operations

Lecture 45 Distinct And Sorted Operators

Lecture 46 Concatenating Streams

Lecture 47 Working With Object Streams

Java developers aiming to expand their skill set with functional techniques,OOP practitioners seeking more concise, testable code,Programmers preparing for interviews looking to stand out with advanced Java skills,Curious learners eager to adopt declarative and immutable coding styles,Anyone transitioning from imperative approaches to modern, functional Java