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JVM JRE JDK Explained in Hindi | Simple Car Analogy | Java for Beginners .
In this lecture we will learn:


What is JVM?

What is JDK?

What is JRE?

jvm jre jdk in java

Why JVM, JRE, and JDK are important

Their uses & how they work together

✅ #1 — JDK (Java Development Kit)

To compile Java code, we need a special tool called JDK.
JDK is the complete package that converts your Java code into bytecode so that it can run on any machine.

JDK includes the compiler (javac) used to convert .java files into .class bytecode.

Bytecode is platform-independent, but to run it we need JVM.

When you install JDK, you automatically get the updated JRE and JVM included.

JDK also contains tools like debugger, jar tool, and documentation generator.

In simple words: JDK = JRE + JVM + Development Tools

✅ #2 — JVM (Java Virtual Machine)

JVM stands for Java Virtual Machine.

JVM is the place where your bytecode gets executed.

JVM plays the biggest role in making Java platform-independent.

You compile code using JDK, and you run it using JVM.

JVM itself is platform-dependent (Windows JVM, Linux JVM, Mac JVM), but bytecode remains the same.

JVM verifies, loads, and executes bytecode with the help of components like Class Loader, Interpreter, and JIT compiler.

In short: JDK compiles → JVM runs

✅ #3 — JRE (Java Runtime Environment)

JRE stands for Java Runtime Environment.

JRE contains all the built-in classes, packages, and libraries required to run a Java program.

It validates and loads the bytecode before passing it to JVM.

JRE acts as an extra layer above the operating system to ensure that Java apps run smoothly.

If your code uses extra libraries, JRE provides the required environment for those libraries.

JRE = JVM + Core Libraries

✅ #4 — Relationship Between JVM, JRE, and JDK

JVM is a part of JRE.

JRE contains JVM + libraries.

JDK contains JRE + JVM + development tools.

For development, you must install JDK.
For running applications, JRE is enough (JVM is included inside JRE).

⭐ Short Summary

JDK → Code ko compile karta hai

JRE → Program run karne ka environment deta hai

JVM → Bytecode ko execute karta hai