1Z0-829 Controlling Program Flow Practice Question
A method contains a try-with-resources statement that uses two resources: a FileInputStream and a BufferedInputStream. The FileInputStream constructor throws a FileNotFoundException. Which statement about resource closing is true?
⚠ Common exam trap
Many exam-takers assume all declared resources are always closed, forgetting that the try-with-resources statement only closes resources that were successfully created, and an exception during construction of the first resource prevents the second from even being declared.
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
✓
No resources are closed because the FileInputStream constructor failed before any resource was opened.
In a try-with-resources statement, resources are closed only if they have been successfully initialized. If the FileInputStream constructor throws a FileNotFoundException, the resource is never created, so the try-with-resources statement does not attempt to close it. The BufferedInputStream is never constructed because the exception occurs before its declaration is reached, so no resources are opened and none need to be closed. Therefore, option C is correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The BufferedInputStream is closed if it was successfully created, but the FileInputStream is not.
Why it's wrong here
The BufferedInputStream is declared second and would not be opened if the first failed.
- ✗
Both resources are closed even if the FileInputStream constructor throws an exception.
Why it's wrong here
Only successfully opened resources are closed.
- ✓
No resources are closed because the FileInputStream constructor failed before any resource was opened.
Why this is correct
The first constructor threw an exception, so no resource was opened.
- ✗
The programmer must explicitly close the resources in a finally block.
Why it's wrong here
Try-with-resources closes resources automatically.
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