Explain what the notify method means in the context of inter-thread interaction and how it is used.

The notify method in the context of inter-thread communication in Java is used to wake up one of the threads that are in the waiting (wait) state on an object monitor.

When a thread calls wait() on an object, it releases the monitor and enters the waiting state. Another thread, after changing the state, can call notify() on the same object to wake up one of the waiting threads. If you want to wake up all waiting threads, notifyAll() is used.

Example of usage:

synchronized (sharedObject) {
    // change the state of sharedObject
    sharedObject.notify(); // wake up one waiting thread
}

It is important that notify is called within a synchronized block to ensure ownership of the object's monitor.

Thus, notify helps coordinate thread work by allowing one thread to signal others that the state has changed and work can continue.