![]() ![]() The collection c and thus cannot call c.retainAll(retain). This method is useful if you do not wish to modify In collection unless retain does not contain e, in whichĬase the cardinality is zero. In the returned collection is the same as the cardinality of e Returns a collection containing all the elements in collection get public static Map.Entry get( Map map,.Parameters: object - the object to get a value from index - the index to get Returns: the object at the specified index Throws: IndexOutOfBoundsException - if the index is invalid IllegalArgumentException - if the object type is invalid Number of entries) as a side effect of this method. Index (or to the end, if index exceeds the Index-th object in the Iterator/Enumeration, if there Iterator or Enumeration - the value returned is the.Returned by the collection's default iterator, if there is such an element. Collection - the value returned is the index-th object.If there is such an entry otherwise an IndexOutOfBoundsException Array - the index-th array entry is returned,.List - this method is equivalent to the list's get method.Map - the value returned is the Map.Entry in position.The supported types, and associated semantics are: IllegalArgumentException if object is not an IndexOutOfBoundsException if there is no such element or Returns the index-th value in object, throwing selectRejected public static Collection selectRejected( Iterable inputCollection,.InputCollection or predicate are not null Returns: the outputCollection Since: 4.1 InputCollection and predicate are not null rejectedCollection - the collection to output rejected elements into, may not be null if the Type Parameters: O - the type of object the Iterable contains R - the type of the output Collection Parameters: inputCollection - the collection to get the input from, may be null predicate - the predicate to use, may be null outputCollection - the collection to output selected elements into, may not be null if the SelectRejected(inputCollection, predicate, rejectedCollection) ![]() Select(inputCollection, predicate, outputCollection) Note: calling the method is equivalent to the following code snippet: If the input predicate is null, no elements are added to Selects all elements from inputCollection into an output and rejected collection,īased on the evaluation of the given predicate.Įlements matching the predicate are added to the outputCollection,Īll other elements are added to the rejectedCollection. containsAny public static boolean containsAny( Collection coll1,.Parameters: coll1 - the first collection, must not be null coll2 - the second collection, must not be null Returns: true iff the intersection of the collections has the same cardinalityĪs the set of unique elements from the second collection Since: 4.0 Depending on the type ofĬollection provided, this method will be much faster than callingĬntainsAll(Collection) instead, though this will come at theĬost of an additional space complexity O(n). With a guaranteed runtime complexity of O(n + m). This method is intended as a replacement for ntainsAll(Collection) Intersection(, ) of coll1 and coll2 has the same cardinality as In other words, this method returns true iff the Which is the same behavior as ntainsAll(Collection). The cardinality of values in coll2 is not taken into account, Note: Maps are not an integral part of the collection framework but are considered as collections because they can store and manipulate groups of objects like collections.Returns true iff all elements of coll2 are also contained Core Collection Framework interfaces are categories into two sets collections and maps. Note: Above two disadvantages can be removed from the collection framework by using generics. It can’t be done compile-time type checking.Reduces effort to design new APIs: because the collection framework eliminates the need to produce ad hoc collections APIs.Increases program speed and quality: The collection framework provides high-performance and high-quality implementations of useful data structures and algorithms which increase the speed and quality.Reduces programming effort: Collection framework provides useful data structure and algorithms for collection manipulation, you not have to write them.Algorithms: are the methods used for collection computations, like searching and sorting.Īdvantages/Benefits of collection framework:.Classes/Implementations are the concrete implementations of the collection interfaces.Interfaces are abstract data types that represent collections and allow collections to be manipulated independently of the details of their representation.Collection framework contains the following: collection framework is used to store, retrieve and manipulate collections. A collection framework is a unified architecture or a set of classes and interfaces for representing and manipulating collections. ![]()
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