1Z0-811 Arrays and Methods Practice Question
Which THREE statements are correct about the 'main' method signature in Java?
⚠ Common exam trap
Oracle often tests the misconception that the main method can have a non-void return type or a different name, tricking candidates who confuse it with other methods or C/C++ entry points.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It must be declared public.
The Java Language Specification (JLS) requires the main method to be declared public so that the JVM can access it from outside the class. Without public visibility, the JVM would not be able to invoke the method as the entry point of the application.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It must be declared public.
Why this is correct
JVM needs access to call it.
- ✗
It can be declared to return an int.
Why it's wrong here
Must be void.
- ✓
It must be declared void.
Why this is correct
The `main` method must be declared `void` because the Java Virtual Machine (JVM) specification strictly mandates this return type for the application's entry point. Deviating from `void` would prevent the JVM from recognising the method as the program's starting point, leading to a `NoSuchMethodError` or similar runtime issue. This requirement is a fundamental part of the `main` method's signature, ensuring all executable Java applications adhere to the standard `public static void main(String[] args)` definition.
- ✓
It must be declared static.
Why this is correct
JVM calls it without an instance.
- ✗
It can be named any valid identifier.
Why it's wrong here
Must be named main.
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