Producing an equivalent map of the desired class. In effect, the latter constructor allows the user to copy any map, Which creates a new map with the same key-value mappings as its argument. "standard" constructors: a void (no arguments) constructor which creates anĮmpty map, and a constructor with a single argument of type Map, Permissible for a map to contain itself as a value, extreme caution isĪdvised: the equals and hashCode methods are no longerĪll general-purpose map implementation classes should provide two Is not permissible for a map to contain itself as a key. A special case of this prohibition is that it The behavior of a map is not specified if the value of an object isĬhanged in a manner that affects equals comparisons while the Note: great care must be exercised if mutable objects are used as map Specific guarantees as to their order others, like the HashMap Some map implementations, like the TreeMap class, make The order in which the iterators on the map's collection views return theirĮlements. The Map interface provides three collection views, whichĪllow a map's contents to be viewed as a set of keys, collection of values, Was a totally abstract class rather than an interface. This interface takes the place of the Dictionary class, which
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