Question 322 of 481
1Z0-811 Exception Handling and Development Tools Practice Question
When using try-with-resources, which interface must the resource implement?
⚠ Common exam trap
Oracle often tests the misconception that any interface with a single method (like `Runnable`) qualifies for try-with-resources, but the key requirement is that the interface must extend `AutoCloseable` and its `close()` method must be the one invoked for cleanup.
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
✓
AutoCloseable
The try-with-resources statement in Java requires that any resource declared in its parentheses implements the `AutoCloseable` interface (or its subinterface `Closeable`). This interface defines a single `close()` method, which the JVM automatically invokes at the end of the try block, ensuring proper resource management without needing an explicit `finally` block.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Serializable
Why it's wrong here
Serializable is for object serialization, not resource management.
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Runnable
Why it's wrong here
Runnable is for threads.
- ✓
AutoCloseable
Why this is correct
AutoCloseable (or its subinterface Closeable) is required for try-with-resources.
- ✗
Comparable
Why it's wrong here
Comparable is for ordering objects.
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Last reviewed: Jun 30, 2026
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