HashMap vs. Hashtable similarities Both the Hashtable and HashMap implement the Map interface and both share the same set of methods used to add, remove and manipulate elements of a key-value, ...

During some distributed Java development, my colleague observed that a NotSerializableException was encountered when he tried to pass the Set returned from Map ‘s (HashMap in particular in this ...

Normal Java Maps only access use of a key to access a value directly, but both directions of access are supported by Guava's bidirectional maps. Guava seems to be receiving more attention these days.