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What is the main difference between Collection and Collections in Java?
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In Java, collection is an interface. In Java, collections is a utility class. 2. It showcases a set of individual objects as a single unit.
Collection is the interface where you group objects into a single unit. Collections is a utility class that has some set of operations you perform on Collection. Collection does not have all static methods in it, but Collections consist of methods that are all static.
The differences between the Collection and Collections are given below. The Collection is an interface whereas Collections is a class. The Collection interface provides the standard functionality of data structure to List, Set, and Queue. However, Collections class is to sort and synchronize the collection elements.
Java Collection framework provides many interfaces (Set, List, Queue, Deque) and classes (ArrayList, Vector, LinkedList, PriorityQueue, HashSet, LinkedHashSet, TreeSet).
Collection is a base interface for most collection classes, whereas Collections is a utility class. I recommend you read the documentation.
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Are you asking about the Collections class versus the classes which implement the Collection interface?
If so, the Collections class is a utility class having static methods for doing operations on objects of classes which implement the Collection interface. For example, Collections has methods for finding the max element in a Collection.
The Collection interface defines methods common to structures which hold other objects. List and Set are subinterfaces of Collection, and ArrayList and HashSet are examples of concrete collections.
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