Popular Java interview topics
Core Java & OOP — inheritance, polymorphism, interfaces vs abstract classes, equals/hashCode contract, immutability.
Collections — ArrayList vs LinkedList, HashMap internals, ConcurrentHashMap, fail-fast vs fail-safe iterators.
Concurrency — threads vs virtual threads, synchronized, volatile, executors, deadlock prevention, CompletableFuture.
JVM & memory — garbage collection, heap vs stack, strong/weak/soft references, class loading.
Spring & frameworks — dependency injection, bean scopes, transactions, REST controllers, Spring Boot auto-configuration.
Algorithms & data structures — big-O complexity, sorting, trees, graphs, dynamic programming.
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Yes — the Swipe and Test modes are free, including a daily quota of AI explanations.
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Java, Python and TypeScript interview questions are available.
Java, Python and TypeScript interview questions are available.
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Swipe left on a question you don't know and get an instant, plain-language breakdown generated by an LLM.
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