Red Hat · Java

Red Hat Java interview questions

Practice Java questions specifically asked in Red Hat interviews – ideal for online test preparation, technical rounds and final HR discussions.

Company: Red HatSubject: Java4 questions in this page

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Red Hat · Java questions (4)

Go through each question and its explanation. Use this page for targeted revision just before your Red Hat Java round.

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1. What is the primary goal of ZGC and Shenandoah collectors?

Difficulty: MediumType: MCQTopic: GC Basics

Both aim for sub-millisecond pauses by doing most GC work concurrently and using barriers to keep mutators running while objects move.

2. What is Metaspace and a common cause of it growing unexpectedly?

Difficulty: EasyType: SubjectiveTopic: JVM Memory

Metaspace holds class metadata (replacing PermGen). A common growth cause is classloader leaks—dynamically loading classes without unloading their defining classloader, often seen in hot-reloaded apps or container redeploys. Each leaked classloader pins its classes and metadata, expanding Metaspace.

3. What does WatchService in NIO.2 provide?

Difficulty: MediumType: MCQTopic: NIO

WatchService lets you register a directory for change events. It’s best effort, may coalesce events, and is not a content diff tool or replication system.

4. Which statement best characterizes the Fork/Join framework?

Difficulty: HardType: MCQTopic: ForkJoin

Fork/Join targets divide-and-conquer algorithms. Workers steal tasks from others’ deques to stay busy. It’s not intended for I/O-heavy workloads nor does it preserve order.

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Red Hat · Java

Red Hat Java interview questions

Practice Java questions specifically asked in Red Hat interviews – ideal for online test preparation, technical rounds and final HR discussions.

Company: Red HatSubject: Java4 questions in this page

Quick overview

Questions

Tagged for this company + subject

Company

Red Hat

View company-wise questions

Subject

Java

Explore topic-wise practice

Red Hat · Java questions (4)

Go through each question and its explanation. Use this page for targeted revision just before your Red Hat Java round.

Back to Red Hat page•View all Java questions

1. What is the primary goal of ZGC and Shenandoah collectors?

Difficulty: MediumType: MCQTopic: GC Basics

Both aim for sub-millisecond pauses by doing most GC work concurrently and using barriers to keep mutators running while objects move.

2. What is Metaspace and a common cause of it growing unexpectedly?

Difficulty: EasyType: SubjectiveTopic: JVM Memory

3. What does WatchService in NIO.2 provide?

Difficulty: MediumType: MCQTopic: NIO

WatchService lets you register a directory for change events. It’s best effort, may coalesce events, and is not a content diff tool or replication system.

4. Which statement best characterizes the Fork/Join framework?

Difficulty: HardType: MCQTopic: ForkJoin

Fork/Join targets divide-and-conquer algorithms. Workers steal tasks from others’ deques to stay busy. It’s not intended for I/O-heavy workloads nor does it preserve order.

Continue your preparation

For complete preparation, combine this company + subject page with full company-wise practice and subject-wise practice. You can also explore other companies and topics from the links below.

Quick navigation:Red Hat company page•Java subject page•All companies•All subjects

Red Hat Java interview questions

Quick overview

1. What is the primary goal of ZGC and Shenandoah collectors?

2. What is Metaspace and a common cause of it growing unexpectedly?

3. What does WatchService in NIO.2 provide?

4. Which statement best characterizes the Fork/Join framework?

Continue your preparation

Master Interviews Anywhere, Anytime

Red Hat Java interview questions

Quick overview

1. What is the primary goal of ZGC and Shenandoah collectors?

2. What is Metaspace and a common cause of it growing unexpectedly?

3. What does WatchService in NIO.2 provide?

4. Which statement best characterizes the Fork/Join framework?

Continue your preparation

Master Interviews
Anywhere, Anytime