- A
A named module is defined by a module-info.class file placed in the root of the module.
Named modules have a module descriptor (module-info.java compiled to module-info.class).
- B
An automatic module can contain a module-info.class file.
Why wrong: If a jar has module-info.class, it is a named module, not automatic.
- C
A jar file placed on the classpath that lacks module-info.class becomes an automatic module.
Why wrong: A jar on the classpath becomes part of the unnamed module; for automatic module, jar must be on module path.
- D
A named module can read an unnamed module by default.
Why wrong: Named modules cannot access unnamed modules unless explicitly allowed via --add-reads or other flags.
- E
An unnamed module is created when code is placed on the classpath.
The classpath forms the unnamed module.
1Z0-829 Java Platform Overview and Packaging Practice Question
This 1Z0-829 practice question tests your understanding of java platform overview and packaging. 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 TWO statements are true about the Java module system (JPMS) as of Java 17?
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
A named module is defined by a module-info.class file placed in the root of the module.
Option A is correct because a named module in JPMS is defined by a module-info.class file (compiled from module-info.java) placed in the root directory of the module. This file declares the module's name, dependencies, and exported packages, making it a fundamental requirement for a named module.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A named module is defined by a module-info.class file placed in the root of the module.
Why this is correct
Named modules have a module descriptor (module-info.java compiled to module-info.class).
Related concept
Read the scenario before looking for a memorised answer.
- ✗
An automatic module can contain a module-info.class file.
Why it's wrong here
If a jar has module-info.class, it is a named module, not automatic.
- ✗
A jar file placed on the classpath that lacks module-info.class becomes an automatic module.
Why it's wrong here
A jar on the classpath becomes part of the unnamed module; for automatic module, jar must be on module path.
- ✗
A named module can read an unnamed module by default.
Why it's wrong here
Named modules cannot access unnamed modules unless explicitly allowed via --add-reads or other flags.
- ✓
An unnamed module is created when code is placed on the classpath.
Why this is correct
The classpath forms the unnamed module.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing the classpath with the module path; candidates often think JARs on the classpath become automatic modules, but automatic modules only arise from JARs on the module path that lack a module-info.class.
Detailed technical explanation
How to think about this question
Under the hood, JPMS distinguishes between named modules (explicitly declared), automatic modules (JARs on module path without module-info), and unnamed modules (classpath code). Automatic modules are granted special privileges, such as reading all other modules, to ease migration from classpath-based applications. A real-world scenario is migrating a legacy library: placing its JAR on the module path without a module-info makes it an automatic module, allowing it to access all other modules while its own packages are implicitly exported.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 1Z0-829 question test?
Java Platform Overview and Packaging — This question tests Java Platform Overview and Packaging — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A named module is defined by a module-info.class file placed in the root of the module. — Option A is correct because a named module in JPMS is defined by a module-info.class file (compiled from module-info.java) placed in the root directory of the module. This file declares the module's name, dependencies, and exported packages, making it a fundamental requirement for a named module.
What should I do if I get this 1Z0-829 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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