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Course Overview: Functional Programming in Java

This course deep-dives into each of the functional programming concepts that got introduced in the Java programming language.

Gopi Gorantala
Gopi Gorantala
2 min read

Table of Contents


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

  • Knowledge of Java basics.
  • Create and run a simple Java program.
  • Collections API (optional)

Install Java 8 or above versions to run the example code snippets locally in your IDE(Integrated Development Environment).

What will you learn in this course?

This course elaborates on the following topics in detail with real-time examples.

  1. What are lambda expressions? How to write them with examples.
  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.
    A) Transformations
    B) Aggregate functions
    C) Sorting objects
    D) Handle duplicates
    E) min and max, etc.

Throughout the course, you can work on practical exercises and examples to help you reinforce your comprehension of functional programming concepts and their application in Java. Upon completing the course, you will have a strong grasp of functional programming with Lambdas and the Streams API in Java.

The most rewarding outcome of this course

Mastering functional programming in Java is incredibly fulfilling.

  1. Enhanced Programming Skills: Functional programming is a powerful paradigm that can significantly improve your programming skills. Completing this course will give you a deep understanding of functional programming principles, lambda expressions, and the Streams API. This knowledge will enable you to write cleaner, more concise, and more maintainable code in Java.
  2. Leveraging Java's Functional Capabilities: Java has evolved to include robust functional programming features, such as lambdas and the Streams API. Mastering these features will allow you to leverage the full potential of the Java language and write more efficient and expressive code. You will be able to tackle complex programming challenges with a functional mindset.
  3. Improved Problem-Solving Skills: Functional programming encourages a different way of thinking about and approaching problems. By understanding functional programming concepts, you will develop a new perspective on problem-solving. This can lead to more elegant and efficient solutions, as well as the ability to think in a more abstract and compositional manner.
  4. Readability and Maintainability of Code: Functional programming emphasizes immutability, pure functions, and avoiding side effects. These principles result in easier-to-read, understand, and maintain code. By applying functional programming techniques learned in the course, you can write more modular, reusable, and testable code.
  5. Adaptability to Modern Software Development: Functional programming is gaining popularity in the software development industry due to its code quality, scalability, and parallelism benefits. Completing this course will equip you with skills in high demand in modern software development. This can open up new opportunities for career advancement or working on challenging projects.

Overall, the most rewarding outcome of this course is the ability to write better code, solve complex problems more effectively, and position yourself as a skilled and adaptable Java developer in the ever-evolving field of software development.


  1. You will have access to sketches and detailed illustrations.
  2. Explanation of code flow with practical examples.
  3. GitHub repository - Streams API.

Wishing you success in mastering this skill and advancing your programming abilities. Keep up the great work with your coding! 🤩

Java Streams APIJava

Gopi Gorantala Twitter

Gopi is an engineering leader with 12+ of experience in full-stack development—a specialist in Java technology stack. He worked for multiple startups, the European govt, and FAANG in India and Europe.


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