Multithreading in Java for Beginners | Threads, Runnable, start() vs run(), sleep() vs join()
Multithreading in Java is how you make a program execute multiple tasks concurrently — and this video covers it from the ground up.
Whether you're revising concurrency and multithreading in Java for a technical round or building a Java multithreading project of your own, you'll walk away with a clear mental model instead of a list of memorized answers.
We start with the fundamentals: what is a thread, and how do you use threads to make your program do more than one thing at a time? From there we look at how to implement multithreading in Java in two ways — first by extending a Thread class, and then by implementing the Runnable interface, which is the approach most real-world code prefers.
Along the way we explore how threads work behind the scenes, the role of the main thread, and the classic confusion between start() and run().
Since Runnable is a functional interface, we also cover implementing Runnable using a Lambda expression — the clean, modern way to write multithreaded code without the boilerplate.
No multithreading guide is complete without the methods you'll reach for every day. We walk through start(), run(), getCurrentThread(), getName(), sleep(), and join() one by one, then settle sleep() vs join() once and for all — because it's one of the most common multithreading in Java interview questions.
To tie everything together, we solve a classic Java multithreading interview question live: printing odd and even numbers in separate threads. It's the perfect test of whether you genuinely understand thread coordination, not just the syntax.
If you've been looking for one complete java multithreading tutorial that covers the Runnable interface in Java, the Thread class, and the questions interviewers actually ask — this is it.
00:00 : Multithreading Introduction
01:00 : Multithreading using Thread Class
07:49 : start() vs run() in Threads
08:50 : Multithreading using Runnable Interface
14:10 : Implementing Runnable via Lambda Expressions
16:56 : Thread.sleep() & thread.join()
23:52 : Multithreading Interview Question
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