Package org.apache.commons.collections4.set

Class MapBackedSet<E,​V>

  • Type Parameters:
    E - the type of the elements in this set
    V - the dummy value type in this map
    All Implemented Interfaces:
    Serializable, Iterable<E>, Collection<E>, Set<E>
    public final class MapBackedSet<E,​V>
extends Object
implements Set<E>, Serializable
    Decorates a Map to obtain Set behaviour.

    This class is used to create a Set with the same properties as the key set of any map. Thus, a ReferenceSet can be created by wrapping a ReferenceMap in an instance of this class.

    Most map implementation can be used to create a set by passing in dummy values. Exceptions include BidiMap implementations, as they require unique values.

    Since:
    3.1
    See Also:
    Serialized Form