Complete Java Collection tutorial for the beginner Collection represents the group of objects. Depending on the method of storing and retrieving, collections are basically divided into three parts – Set , Map and List . Where Set does not contain duplicate values, Map contains key value type of data whereas List can have a duplicate values stored in it sequentially. This framework is provided in “java.util” package. Collection is the parent interface of all collections in java. Following list describes the core collection interfaces.
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