Java Stream Operations Explained | flatMap() vs peek() with Hands-on Examples |Java Streams Tutorial
In this video, you'll learn two important Java Stream operations: flatMap() and peek(), with easy-to-understand explanations and practical coding examples.
Whether you're preparing for Java interviews or improving your Java Stream API knowledge, this tutorial will help you understand when and why to use these operations.
📌 Topics Covered
What is flatMap()?
Difference between map() and flatMap()
Flattening nested collections using flatMap()
flatMap() with multiple classes
Real-world examples of flatMap()
What is peek()?
Using peek() for debugging Stream pipelines
Execution flow of peek()
peek() vs map()
Common mistakes and best practices
Interview questions on flatMap() and peek()
💻 Hands-on Examples
Department → Employees
Student → Subjects
Order → Items
Company → Departments → Employees
Logging intermediate Stream operations using peek()
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