Map.true if and only if this map contains a mapping for
the given key.true if and only if this map associates one or more
keys to the given value.true if and only if this map is empty.null value is accepted nor returned and (2) the methods that
verify containment accept only objects of type K or
V.OptMap.Map.OptMap.Copyright © 2017 Chair of Automata Theory - TU Dresden. All rights reserved.