What I'm looking for is a type of collection where each element in the collection is a pair of values. And it's not threadsafe because 'left' and 'right' could be mutable. Java from a long time but am not really able to get to undertsand the concepts well enough to use them wherever needed. I don't know how to convert HashMap to String, as toString() format is not the one I wanted. Bouncy Castle provider also supports key spec objects for cases where the key material is already available and the use of a KeyPairGenerator is not required.
