Java Execution Explained: JDK vs JRE vs JVM vs JIT

Описание: Understand exactly How Java runs! 🚀 In this video we break down the *Java execution model* — from source code to bytecode to the JVM and JIT compiler — and run our first program step-by-step.

👉 What’s inside:
Java execution model: .java → javac → .class bytecode → JVM interpretation → JIT-compiled native code
JDK vs JRE vs JVM vs JIT: what each includes, and when each matters in development & runtime
HotSpot overview: tiered compilation (C1/C2) and why startup vs peak performance differ
Compile & run Hello World end-to-end with `javac` and `java`

💡 Why it matters:
“Write once, run anywhere” → platform-neutral bytecode + JVM portability
JIT optimizations deliver native-level speed on your machine
Clear mental model of JDK/JRE/JVM reduces setup errors and accelerates learning

⏱ Chapters / Timestamps:
0:00 Intro
0:50 What is Java?
1:55 Features of JAVA
4:00 Architecture of JAVA
0:40 Source code → Bytecode → JVM
5:27 JDK vs JRE vs JVM vs JIT
7:52 How JAVA Code is Executed
2:10 JDK vs JRE vs JVM vs JIT
13:00 compiler vs interpreter example
16:30 JAVA is compiled and Interpreted both
Java Playlist link-    • Learn Java Easily in 2025 | Beginner to Ad...  

📌 Next steps:
👉 Continue the series playlist to build momentum in Java 2025 roadmap.
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