1Z0-811 Exception Handling and Development Tools Practice Question
A custom exception class must extend which class to be a checked exception?
⚠ Common exam trap
Test-takers frequently confuse `Throwable` with `Exception` or think that extending `RuntimeException` still produces a checked exception, but the key distinction is that only subclasses of `Exception` (excluding `RuntimeException` and its subclasses) are checked.
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
✓
Exception
In Java, a checked exception is any exception that is a subclass of `Exception` but not a subclass of `RuntimeException`. To create a custom checked exception, your class must extend `Exception` (or a subclass of `Exception` that is itself a checked exception). This forces callers to handle or declare the exception, enforcing compile-time checking.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Throwable
Why it's wrong here
Extending Throwable is possible but not standard; Exception is the intended parent.
- ✗
Error
Why it's wrong here
Extending Error creates an unchecked exception, not meant for recoverable conditions.
- ✗
RuntimeException
Why it's wrong here
Extending RuntimeException creates an unchecked exception.
- ✓
Exception
Why this is correct
Any class that extends Exception (and not RuntimeException) is a checked exception.
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