Скачать или смотреть Intermediate 5 Java interviews Questions with Answers (2025 Edition) | 2025-08-29 06:16 PM

📘 Neulax - Java Interview Prep
This video contains 5 Java interview questions with answers.

📝 Questions & Answers:

Q1: What is Collectors.groupingByConcurrent in Java?
A1: Collectors.groupingByConcurrent groups stream elements concurrently into a ConcurrentMap—useful with parallel streams to build multi-bucket aggregations efficiently.

Q2: What is SoftReference vs WeakReference scenarios in Java?
A2: SoftReference is useful for caches: the JVM clears soft references before throwing OutOfMemoryError, so cached data stays until memory is low.

Q3: What is HttpResponse.BodyHandlers in Java?
A3: HttpResponse.BodyHandlers control how responses are read (asString, ofByteArray, ofFile); use streaming handlers for large responses to avoid OOM.

Q4: What is PhantomReference use in Java?
A4: PhantomReference is used for post-finalization cleanup; unlike weak/soft refs, get() always returns null and references are enqueued after the object becomes phantom reachable.

Q5: What is CompletableFuture thenCompose vs thenApply in Java?
A5: thenCompose flattens nested futures by chaining asynchronous operations (flatMap-like), while thenApply maps the result synchronously (map-like) and returns a nested future if it produces one.

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