The correct answer is that it is an unchecked exception. This is because any custom exception that extends RuntimeException inherits the property of being unchecked, meaning the compiler does not enforce handling or declaration in a method signature. In Java, checked exceptions extend Exception (excluding RuntimeException), while unchecked exceptions extend RuntimeException or Error. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this distinction is frequently tested in questions about exception hierarchy, multi-catch blocks, and method overriding—where an overriding method cannot throw a broader checked exception but can throw any unchecked exception. A common trap is assuming all custom exceptions are checked; remember that the parent class determines the type. Memory tip: “Runtime is unchecked—no compile-time check required.”
1Z0-829 Handling Exceptions Practice Question
This 1Z0-829 practice question tests your understanding of handling exceptions. 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.
Exhibit
Refer to the exhibit.
public class CustomException extends RuntimeException {
public CustomException(String message) {
super(message);
}
}
Usage:
throw new CustomException("Error");
Given the code in the exhibit, which of the following is true about this custom exception?
Refer to the exhibit.
public class CustomException extends RuntimeException {
public CustomException(String message) {
super(message);
}
}
Usage:
throw new CustomException("Error");
A
It cannot be used with multi-catch because it is unchecked.
Why wrong: Unchecked exceptions can be used in multi-catch.
B
It is an unchecked exception.
Extends RuntimeException.
C
It must be caught or declared in the method signature.
Why wrong: Unchecked exceptions do not require handling.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It is an unchecked exception.
Option B is correct because the custom exception extends RuntimeException, which makes it an unchecked exception. Unchecked exceptions do not require handling or declaration in the method signature, and they can be used in multi-catch blocks.
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.
✗
It cannot be used with multi-catch because it is unchecked.
Why it's wrong here
Unchecked exceptions can be used in multi-catch.
✓
It is an unchecked exception.
Why this is correct
Extends RuntimeException.
Related concept
Read the scenario before looking for a memorised answer.
✗
It must be caught or declared in the method signature.
Why it's wrong here
Unchecked exceptions do not require handling.
✗
It must implement the Serializable interface.
Why it's wrong here
Not required.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the misconception that all custom exceptions must be checked exceptions, but the trap here is that a custom exception extending RuntimeException is unchecked, so it does not require handling or declaration, and it can still be used in multi-catch blocks.
Detailed technical explanation
How to think about this question
In Java, unchecked exceptions extend RuntimeException or Error, and they are not subject to the compile-time checking of the catch-or-specify requirement. This design allows for programming errors (like NullPointerException) to propagate without mandatory handling, simplifying code in many cases. A subtle behavior is that even though unchecked exceptions can be caught, they are often left to bubble up to a top-level handler, which is a common pattern in frameworks like Spring for transaction rollback.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Handling Exceptions — This question tests Handling Exceptions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It is an unchecked exception. — Option B is correct because the custom exception extends RuntimeException, which makes it an unchecked exception. Unchecked exceptions do not require handling or declaration in the method signature, and they can be used in multi-catch blocks.
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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Question Discussion
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