Quick Answer
The correct answer is that a Java source file can contain exactly one public class, and that class name must match the file name. This rule exists because the Java compiler enforces a strict one-to-one mapping between public top-level classes and their source files, ensuring the classpath and package structure remain unambiguous for the JVM’s class loader. On the Oracle Java Foundations 1Z0-811 exam, this concept tests your understanding of fundamental file organization and compilation requirements, often appearing as a true/false or multiple-choice trap where a file named `MyApp.java` contains a public class `myapp`—that would fail due to case sensitivity. A common memory tip is to think of the file name as the public class’s official ID badge: they must be identical in spelling and case, or the compiler will refuse to compile. Remember: one public class, one file, exact name match.
This 1Z0-811 practice question tests your understanding of java basics and syntax. 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.
A team decides to use a single Java source file for a small application. Which statement is true about the file structure?
It must have a main method to compile.
Why wrong: Compilation does not require main.
It can contain multiple public classes.
Why wrong: Only one public class per file.
It can contain exactly one public class with the same name as the file.
This is the standard rule.
The public class name can differ from the file name.
Why wrong: Must match.
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 can contain exactly one public class with the same name as the file.
Option C is correct because in Java, when a source file contains a public class, the file name must exactly match the public class name, including case sensitivity. This is a fundamental rule enforced by the Java compiler to ensure proper class loading and package structure. The file can have at most one public top-level class, and that class name determines the file name.
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 have a main method to compile.
Why it's wrong here
Compilation does not require main.
It can contain multiple public classes.
Why it's wrong here
Only one public class per file.
It can contain exactly one public class with the same name as the file.
Why this is correct
This is the standard rule.
Related concept
Read the scenario before looking for a memorised answer.
The public class name can differ from the file name.
Why it's wrong here
Must match.
Common exam traps
Oracle often tests the misconception that a main method is required for compilation, or that multiple public classes are allowed in one file, leading candidates to overlook the strict file-name-to-public-class-name correspondence rule.
Detailed technical explanation
The Java Language Specification (JLS §7.6) mandates that when a compilation unit defines a public class, the unit's file name must be the binary name of that class. This rule exists to support the Java platform's class file discovery mechanism, where the JVM and class loaders locate .class files based on the class name. A common real-world scenario is when developers accidentally rename a file without updating the class name, causing a compilation error that can be confusing for beginners.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 1Z0-811 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Java Basics and Syntax — This question tests Java Basics and Syntax — Read the scenario before looking for a memorised answer..
The correct answer is: It can contain exactly one public class with the same name as the file. — Option C is correct because in Java, when a source file contains a public class, the file name must exactly match the public class name, including case sensitivity. This is a fundamental rule enforced by the Java compiler to ensure proper class loading and package structure. The file can have at most one public top-level class, and that class name determines the file name.
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
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