Question 286 of 481
1Z0-811 What is Java Practice Question
A company is developing a Java-based inventory management system. The system runs on a single server and processes up to 1000 concurrent requests. The development team has implemented the code using multiple threads to handle requests. Recently, the system has been experiencing intermittent data corruption in the inventory counts. After reviewing the code, the team suspects that the issue is related to thread safety. The team is considering the following solutions: (A) Use the 'synchronized' keyword on all methods that update inventory counts. (B) Use 'volatile' keyword on the inventory count variables. (C) Use 'AtomicInteger' for inventory counts. (D) Increase the number of threads to handle requests faster. Which solution should the team implement to fix the data corruption issue with minimal performance impact?
⚠ Common exam trap
Oracle often tests the distinction between visibility (volatile) and atomicity (AtomicInteger), trapping candidates who think volatile alone solves read-modify-write race conditions.
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
✓
Use 'AtomicInteger' for inventory counts.
AtomicInteger provides thread-safe atomic operations (like incrementAndGet) without requiring synchronization, ensuring consistent inventory counts under concurrent access with minimal performance overhead compared to full method synchronization.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use 'AtomicInteger' for inventory counts.
Why this is correct
AtomicInteger provides lock-free, thread-safe operations with good performance.
- ✗
Increase the number of threads to handle requests faster.
Why it's wrong here
More threads can increase contention and does not fix data corruption.
- ✗
Use 'volatile' keyword on the inventory count variables.
Why it's wrong here
Volatile does not guarantee atomicity for compound operations like increment.
- ✗
Use the 'synchronized' keyword on all methods that update inventory counts.
Why it's wrong here
Synchronization can cause contention and performance issues.
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Last reviewed: Jun 30, 2026
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