![]() Similarly, the remove method is defined to remove a ![]() Guarantees that the Collection will contain the specifiedĮlement after the call completes, and returns true if the Collection changes as a result of the call. Sense for collections that allow duplicates as well as those that don't. Iterator over the collection ( iterator ).Īdd method is defined generally enough so that it makes It has methods to tell you how many elements are in the collection ( size, isEmpty ), to check if a given object is in theĬollection ( contains ), to add and remove an element from theĬollection ( add, remove ), and to provide an Interface does about what you'd expect, given that a Collection represents a group of The following one-linerĬreates a new ArrayList (an implementation of the List interface), initially containing all of the elements in c :īoolean remove(Object element) // Optionalīoolean addAll(Collection c) // Optionalīoolean removeAll(Collection c) // Optionalīoolean retainAll(Collection c) // Optional Suppose you have a Collection, c, which may be a List, a Set, or some other kind of Collection. This constructor allows the caller to create a Collection of a desired implementation type, initiallyĬontaining all of the elements in any given Collection, whatever its subinterface This constructor initializes the new Collection to contain all of the elements in the specified Collection. Implement some subinterface of Collection like Set or List ) have a constructor that takes a Collection argument. For example, byĬonvention all general-purpose collection implementations (which typically The primary use of the Collection interface is to pass aroundĬollections of objects where maximum generality is desired. Instructor: Jean-Claude Franchitti Session: 3Ĭollection represents a group of objects, known as its elements. Detailed Review of the Collections Framework
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