Collection Vs Collections in Java || Java Interview Question || Asked by many interviewers
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Collection Interface
The Collection interface is the root interface in the Java Collections Framework. It represents a group of objects, known as elements. Some of the key points about Collection include:
Interface: Collection is an interface that provides the standard functionality of a collection of objects.
Subinterfaces: Many other interfaces extend Collection, such as List, Set, and Queue.
Common Methods: The Collection interface defines several methods that are implemented by all collections, including:
add(E e): Adds an element to the collection.
remove(Object o): Removes an element from the collection.
size(): Returns the number of elements in the collection.
isEmpty(): Checks if the collection is empty.
contains(Object o): Checks if the collection contains a specific element.
iterator(): Returns an iterator over the elements in the collection.
clear(): Removes all elements from the collection.
The Collections class is a utility class that contains static methods to operate on or return collections. Key points about Collections include:
Utility Class: Collections is a final class with static methods that provide algorithms for collections, such as sorting and searching.
Methods: Some of the most commonly used methods in the Collections class include:
sort,reverse,shuffle
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