In Java, a collection is an object that represents a group of elements, which can be of any type, such as integers, strings, objects, etc. Collections are used to store, manipulate, and retrieve data in a structured way.
Java provides a set of interfaces and classes that are collectively known as the Java Collections Framework. This framework provides a standard way to handle collections and includes interfaces such as List, Set, and Map, and classes such as ArrayList, LinkedList, HashSet, and HashMap.
Using these interfaces and classes, developers can create and manipulate collections of data efficiently and easily. For example, a List is an ordered collection that allows duplicates, while a Set is an unordered collection that does not allow duplicates.
Some of the advantages of using collections in Java are: