Introduction to Multithreading in Java | Process vs Thread | Java Full Course #47

In this lecture, we begin our journey into Java Multithreading, starting from absolute fundamentals and building a strong conceptual foundation.

Before learning how to create threads, it is critical to understand what actually runs inside a system, how memory is structured, and how concurrency works at both process and thread levels.

What You’ll Learn in This Video
Program → Process → Thread (Conceptual Flow)
What is a Program?
What happens when a program is executed?
What is a Process?
What is a Thread?
Why CPU executes threads, not processes

Memory Structure Inside a Process
Heap Memory (objects, shared across threads)
Stack Memory (per thread execution)
Method Area / Metaspace
Program Counter (PC)
How memory is organized when a Java program runs

How Execution Actually Happens
Role of CPU and OS scheduler
Context switching explained conceptually
Why threads are the unit of execution

Multitasking vs Multithreading
What is Multitasking?
What is Multithreading?
Key differences and real-world examples
How they work together in modern systems

Why Learn Java?
Java is one of the most powerful and widely used programming languages in the world.
It is used in:
Backend development
Enterprise applications
Android development
Banking systems
Large-scale distributed systems

If you want to master Data Structures, Spring Boot, Microservices, or System Design, Java fundamentals are essential.

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