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Introduction to Java Streams API

This course deep-dives into each functional programming concept introduced in the Java 8 programming language.

Gopi Gorantala
Gopi Gorantala
2 min read

Table of Contents

This course deep-dives into each functional programming concept introduced in the Java 8 programming language.

Intended audience

To ace Java coding interviews for tech companies, it is necessary to understand Streams API, and its operations, which are usually short in syntax.

  • This course is designed for everyone who wants to improve their Java coding skills.
  • It targets all Java software aspirants who want to get strong with Streams API introduced in Java 8.
  • This is a critical topic for interviews with FAANG companies.

We will go through what functional programming is, why they were introduced, and what gap they fill in the Java ecosystem.

Introduce yourself to functional programming.

Functional programming has gained popularity recently, and the number of lines written by developers in the last few years using functional programming(for open-source projects) did make a hustle around Java developers.

  1. No wonder developers fell in love with functional programming with fewer lines of code.
  2. The Java community encourages more and more developers to embrace this programming style.
  3. This course teaches you how to write functional programming code with lambda expressions, Streams API, etc.
  4. A detailed knowledge of this topic will help you write clean and single-line Java code snippets for most business use cases.
  5. Functional programming provides high performance in processing large/extensive data for applications.

This course benefits all Java developers who want to get strong with modern Java 8/11/17 features; wait, there’s much more we will discuss in this course.


If you understand Java programming syntax, this course will help you re-write your collections API with Streams API.

This course is perfect for you if you are new to collections API. An explanation follows every example code in this course.

To take full advantage of this course, you should ideally have the following:

  • Basics of a Java programming language.
  • Variables and data types
  • Loops
  • Collections API (optional)

Free IDE (IntelliJ Idea)

JetBrains is free for students and teachers: Get free access to all JetBrains IDEs for personal use at school or home.

I use IntelliJ Idea, WebStorm, and Datagrip in my everyday use at work and personally. Apart from its basic tooling tasks, it offers even more advanced features. No IDE comes closer to JetBrains IDE’s.

IntelliJ Idea is the number one choice, per the survey conducted by open Java communities and the Java official channel.

For instance, I was asked only to use IntelliJ Idea when I worked for Apple, Jive SBS, a Medical startup and European Commission companies.

Please take full advantage of Jetbrain tools for what it offers in the community and the ultimate edition.

What will you learn in this course?

This course elaborates on all of the following topics in detail with real-world use case examples:

  1. What are lambda expressions? How to write them?
  2. Interface types, use of them?
  3. What are functional interfaces? more about the Function package.
  4. built-in functional interfaces with examples.
  5. Method references.
  6. Streams API:
    • Transformations
    • Aggregate functions
    • Sorting objects
    • Handle duplicates
    • min and max, etc.

The most rewarding outcome of this course

The most rewarding outcome of this course is that you will learn the following:

  1. The most common ways to solve problems using Java functions and streams API with real-world business use-case examples.
  2. Hands-on practical examples.
  3. Hands-on practical coding challenges with examples and illustrations.
  4. Resources - To keep things as organized as possible for you, I have created a repository and attached all solutions.
  5. Java Solutions - --GIT LINK IS INPROGRESS---
  6. Questions that test your knowledge of each chapter.

Happy coding 🤩!!

Core Java

Gopi Gorantala Twitter

Gopi has been a Full Stack(Java+React) since 2016. He worked in Europe, and India, from startups to tech giants. He has a strong engineering professional with a Bachelor's in Satellite Communications.


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