A synchronization point at which two threads can exchange objects. Each thread presents some object on entry to the exchange method and receives the object presented by the other thread on return.
Java provides a basic set of synchronisation methods within java.lang.Object allowing threads to wait for notification from other threads. Using the wait() and notify() methods threads can synchronise with each other. However in order to use these methods they must be called within a synchronized code block otherwise an IllegalMonitorException results. The thread that requires a synchronisation signal from another thread will call on the wait() method for an object. This will set the thread into a suspended mode until another thread sends a trigger by using the notify() method on the same object.
