Real-world mechanisms, state management, edge cases, performance trade-offs, and practical coding.
ConcurrentModificationException using a modCount check.ArrayList, HashMap, HashSet iterators.CopyOnWriteArrayList, ConcurrentHashMap iterators.Hashtable or Collections.synchronizedMap), it uses Node-level synchronization using CAS (Compare-And-Swap) for empty buckets and locks only the head node of a specific bucket segment during write operations.execute(): Defined in the Executor interface. Accepts a Runnable task, returns void (fire-and-forget), and propagates unhandled exceptions directly to the thread's uncaught exception handler.submit(): Defined in ExecutorService. Accepts Runnable or Callable tasks, returns a Future object wrapping the execution state, and swallows exceptions, returning them inside the Future.get() call.corePoolSize: The minimum number of threads kept alive in the pool, even if they are idle.maximumPoolSize: The maximum number of active threads allowed to run concurrently in the pool.keepAliveTime: The maximum duration that excess idle threads (beyond core size) wait for new tasks before terminating.workQueue: The queue (BlockingQueue) holding tasks before they are picked up by active threads (e.g., LinkedBlockingQueue, SynchronousQueue).newFixedThreadPool(n)): Uses a fixed number of threads and an unbounded queue.newCachedThreadPool()): Spawns new threads dynamically as needed, reclaiming idle threads after 60 seconds; uses a SynchronousQueue (no storage capacity).newSingleThreadExecutor()): Spawns exactly one worker thread executing tasks sequentially in FIFO order.newScheduledThreadPool(n)): Scheduled to execute commands after a delay or periodically.You've completed the 5 free sample questions. Get unrestricted lifetime access to every question, model answer, implementation challenge, and all 27+ technologies for a single payment.
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