When two or more thread needs to exchange information between them in an application, Inter-thread communication is required. Hence, we can also call it Co-Operation.

The methods that are used for this communication are:

1. wait()
2. notify()
3. notifyAll()

## 1. wait()

This method is written as:

This causes the current thread to wait until another thread invokes the notify() method that is it waits until the object is notified.

## 2. notify()

This method is written as:

This method wakes up a single thread that is waiting on this object’s monitor.

## 3. notifyAll()

This method is written as:

This method wakes up all the threads that called wait( ) on the same object.

Output:

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