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Learn Java Profiling – Module 1 Lesson 2 – Quiz

Last updated: March 12, 2026

Written by: baeldung

Learn Java Profiling
Lesson 2: Profiling Metrics
Learn Java Profiling – Module 1 Lesson 2 – Quiz

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Question 1 of 5

1. Question

What does a method’s high wall clock time but low CPU time typically indicate?

The method contains expensive computations that need optimization
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The method is waiting on an external resource such as a database or network call
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The method is creating too many short-lived objects
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The method is being invoked an unusually high number of times
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Question 2 of 5

2. Question

In a healthy Java application, what memory usage pattern do we typically observe in a profiler’s heap graph?

A steadily rising baseline after each garbage collection cycle
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A flat line with occasional large spikes
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A sawtooth pattern where memory rises as objects are created and drops after garbage collection
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Continuous growth until the application is restarted
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Question 3 of 5

3. Question

Which thread state indicates that a thread is waiting to acquire a lock that another thread currently holds?

WAITING
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RUNNABLE
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TIMED_WAITING
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BLOCKED
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Question 4 of 5

4. Question

According to the 80:20 rule applied to profiling, how should we prioritize our optimization efforts?

Optimize every method evenly to improve overall performance
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Focus on methods with the lowest invocation counts first
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Focus our efforts on the top methods consuming the most CPU time
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Only optimize methods in the application's main thread
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Question 5 of 5

5. Question

When profiling web request latency, why do we use percentiles such as P95 and P99 in addition to averages?

Percentiles are simpler to compute than averages in a distributed system
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Averages capture only memory usage, not response time
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Percentiles only measure the fastest requests to confirm baseline performance
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Averages can hide poor performance of the slowest requests, which percentiles reveal
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