What happens when you run java com.example.Main from the command line?
PICTURE THIS: HOW JAVA RUNS
Simple meaning
The launcher starts a JVM, the classloader loads Main and its dependencies, and the JVM looks for public static void main(String[]).
WHY — JVM instead of guessing?
Why interviewers care about JVM:
who only read docs from people who shipped.
and tied to Backend work.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1The launcher starts a
JVM, the classloader loads Main and its dependencies, and the JVM looks for public static void main(String[]).
- 2Why it exists
Static initializers run before main.
- 3If main is missing
or not static, you get a runtime error rather than a compile error from the launcher.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
The launcher starts a JVM, the classloader loads Main and its dependencies, and the JVM looks for public static void main(String[]). Static initializers run before main.