1Z0-811 What is Java Practice Question
Exhibit
Refer to the exhibit. ``` java -Xms512m -Xmx2g -XX:+UseG1GC -jar application.jar ```
Based on the command, which garbage collector is configured for this application?
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
✓
Garbage-First (G1GC)
XX:+UseG1GC explicitly sets the Garbage-First (G1GC) garbage collector. Option A is incorrect; Parallel GC would be enabled with -XX:+UseParallelGC. Option C is incorrect; Serial GC would be enabled with -XX:+UseSerialGC. Option D is incorrect; CMS would be enabled with -XX:+UseConcMarkSweepGC.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Parallel GC
Why it's wrong here
Parallel GC is not enabled by this flag.
- ✓
Garbage-First (G1GC)
Why this is correct
The flag -XX:+UseG1GC enables G1GC.
- ✗
Serial GC
Why it's wrong here
Serial GC requires -XX:+UseSerialGC.
- ✗
Concurrent Mark Sweep (CMS)
Why it's wrong here
CMS would use a different flag.
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