1Z0-829 Handling Exceptions Practice Question
Which of the following is a checked exception in Java?
⚠ Common exam trap
Watch out — candidates often confuse any exception that occurs at runtime with a 'checked exception', forgetting that only subclasses of Exception that are not subclasses of RuntimeException are checked, so they incorrectly select NullPointerException or ArithmeticException.
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
✓
IOException
IOException is a checked exception in Java. Checked exceptions are subclasses of Exception (excluding RuntimeException and its subclasses), and the compiler enforces that they are either caught or declared in the method's throws clause. IOException directly extends Exception, making it a checked exception that must be handled at compile time.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
NullPointerException
Why it's wrong here
Unchecked runtime exception.
- ✗
ArithmeticException
Why it's wrong here
Unchecked runtime exception.
- ✓
IOException
Why this is correct
Checked exception, must be handled or declared.
- ✗
IllegalArgumentException
Why it's wrong here
Unchecked runtime exception.
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