Chapter 10. The Main Interfaces of the Java Collections Framework
Figure 10-1 shows the
main interfaces of the Java Collections Framework, together with one other—Iterable
—which is outside the Framework but is an
essential adjunct to it. Its purpose is as follows:
Iterable
defines the contract that a class has to fulfill for its instances to be usable with the foreach statement.
And the Framework interfaces have the following purposes:
Collection
contains the core functionality required of any collection other than a map. It has no direct concrete implementations; the concrete collection classes all implement one of its subinterfaces as well.Set
is a collection, without duplicates, in which order is not significant.SortedSet
automatically sorts its elements and returns them in order.NavigableSet
extends this, adding methods to find the closest matches to a target element.Queue
is a collection designed to accept elements at its tail for processing, yielding them up at its head in the order in which they are to be processed. Its subinterfaceDeque
extends this by allowing elements to be added or removed at both head and tail.Queue
andDeque
have subinterfaces,BlockingQueue
andBlockingDeque
respectively, that support concurrent access and allow threads to be blocked, indefinitely or for a maximum time, until the requested operation can be carried out.List
is a collection in which order is significant, accommodating duplicate elements.Map
is a collection which uses key-value associations ...
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