Quick Answer
The correct answer is that the main method must be declared static. This requirement exists because the Java Virtual Machine invokes the main method without creating an instance of the enclosing class; a static method belongs to the class itself, not to any object, allowing the JVM to call it directly as the program’s entry point. On the Oracle Java Foundations 1Z0-811 exam, this concept tests your understanding of the JVM’s startup sequence and the mandatory signature components: public, static, void, and a String array parameter. A common trap is forgetting that the method must be public—the JLS mandates public visibility so the JVM can access the method from outside the class, even if the class is not instantiated. Remember the mnemonic “PSVM” (public static void main) to recall the required modifiers in order, and note that the parameter can be written as String[] args, String... args, or String args[].
This 1Z0-811 practice question tests your understanding of arrays and methods. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which THREE statements are correct about the 'main' method signature in Java?
It must be declared public.
JVM needs access to call it.
It can be declared to return an int.
Why wrong: Must be void.
It must be declared void.
No return value.
It must be declared static.
JVM calls it without an instance.
It can be named any valid identifier.
Why wrong: Must be named main.
Answer choices
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.
Option A is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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.
Related concept
Read the scenario before looking for a memorised answer.
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
No return value.
Related concept
Read the scenario before looking for a memorised answer.
It must be declared static.
Why this is correct
JVM calls it without an instance.
Related concept
Read the scenario before looking for a memorised answer.
It can be named any valid identifier.
Why it's wrong here
Must be named main.
Common exam traps
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.
Detailed technical explanation
The JVM's bootstrap class loader invokes the main method via reflection, specifically looking for a method with the signature 'public static void main(String[])'. If the method is not static, the JVM cannot call it without an instance of the class, which is why static is mandatory. In real-world scenarios, changing the main method signature (e.g., making it non-static) is a common mistake when running simple Java programs from the command line.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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FAQ
Arrays and Methods — This question tests Arrays and Methods — Read the scenario before looking for a memorised answer..
The correct answer is: It must be declared public. — Option A is correct because 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This 1Z0-811 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-811 exam.
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