Understanding wait(), notify(), and notifyAll() vs yield(), join(), and sleep() in Java: A Comprehensive Guide

Thread Synchronization Methods

Sanjay Singh

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5 min read

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Oct 19, 2024

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1. wait()

Purpose: Causes the current thread to wait until another thread invokes notify() or notifyAll() on the same object.

Behaviour: Releases the lock and enters the waiting state.

2. notify()

Purpose: Wakes up one waiting thread.

Behaviour: Only one thread is notified and attempts to acquire the lock.

3. notifyAll()

Purpose: Wakes up all waiting threads.

Behaviour: All threads are notified but only one can acquire the lock at a time.

Thread Control Methods

1.yield()

Purpose: Suggests to the thread scheduler that the current thread is willing to pause.

Behavior: Moves the thread to the runnable state, allowing other threads to run.

2. join()

Purpose: Waits for a specified thread to finish its execution.

Behavior: The calling thread is paused until the target thread completes.

3. sleep()

Purpose: Pauses the current thread for a specified duration.

Behavior: The thread enters a sleeping state for the…