juniorJava
What is JVM, JRE, and JDK?
Updated May 6, 2026
Short answer
JDK is development kit, JRE is runtime environment, JVM executes bytecode.
Deep explanation
JDK includes compiler and tools, JRE includes libraries and JVM, JVM executes Java bytecode across platforms.
Real-world example
JDK used by developers, JRE used by users running apps.
Common mistakes
- Confusing JRE with JVM functionality.
Follow-up questions
- Can JVM run without JRE?
- Why is JVM platform independent?