Multithreading
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Threads Basics
Introduction to multithreading
Critical interview topic
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Creating Threads
Thread class and Runnable interface
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Thread Lifecycle
New, Runnable, Running, Waiting, Terminated
Thread states are frequently asked
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Thread Methods
start(), run(), sleep(), join(), etc.
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Thread Priority
Setting and getting thread priorities
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Synchronization
synchronized keyword
Very important concept
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Synchronized Methods
Method-level synchronization
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Synchronized Blocks
Block-level synchronization
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Static Synchronization
Class-level locks
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Inter-Thread Communication
wait(), notify(), notifyAll()
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Deadlock
Understanding and preventing deadlocks
Common interview scenario
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Thread Pool
Executor framework
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ExecutorService
Managing thread execution
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Callable and Future
Tasks that return results
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CompletableFuture
Asynchronous programming (Java 8+)
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Locks
ReentrantLock and Lock interface
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ReadWriteLock
Multiple readers, single writer
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Atomic Variables
AtomicInteger, AtomicLong, etc.
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volatile Keyword
Visibility and ordering guarantees
Understanding memory visibility
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ThreadLocal
Thread-confined variables
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Semaphore
Controlling access to resources
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CountDownLatch
Waiting for multiple threads
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CyclicBarrier
Synchronization barrier
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Concurrency Best Practices
Writing thread-safe code