Explanation/Reference:
Explanation:
A watch key has a state. When initially created the key is said to be ready. When an event is detected then the key is signalled and queued so that it can be retrieved by invoking the watch service's poll or take methods. Once signalled, a key remains in this state until its reset method is invoked to return the key to the ready state.
Reference: https://docs.oracle.com/javase/7/docs/api/java/nio/file/WatchKey.html