Return the value of the key exactly matching the provided key or, if none, the key just after/before it based on the setting of the second argument
param: key a key param: after indicates whether to look beyond or before the given key, where there is no exact match
a pointer to the value, or null if not present
NoSuchElementException if none found
See Implementation
Return the value of the key exactly matching the provided key or, if none, the key just after/before it based on the setting of the second argument
param: key a key param: after indicates whether to look beyond or before the given key, where there is no exact match