The Main Interfaces of the Java Collections Framework
The main interface of the java collection frameworks.
shows the main interfaces of the Java Collections Framework, together with one otherIterablewhich is outside the Framework but is an essential adjunct to it. Its purpose is as follows:
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Iterable defines the contract that a class has to fulfill for its instances to be usable with the foreach statement.
- 기본적인 컬렉션 인터페이스로 순차 열람을 지원
And the Framework interfaces have the following purposes:
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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.
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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.
- 중복된 원소가 없는 컬렉션.
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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 subinterface Deque extends this by allowing elements to be added or removed at both head and tail. Queue and Deque have subinterfaces, BlockingQueue and BlockingDeque 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.
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List is a collection in which order is significant, accommodating duplicate elements.
- 원소의 순서가 정의 되어 있는 컬렉션.
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Map is a collection which uses key-value associations to store and retrieve elements. It is extended by ConcurrentMap, which provides support for concurrent access, by SortedMap, which guarantees to return its values in ascending key order, by NavigableMap which extends SortedMap to find the closest matches to a target element, and by ConcurrentNavigableMap which extends ConcurrentMap and NavigableMap.
