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1.	What is Collection in Java?
Answer» In Java, a collection is a FRAMEWORK that provides an architecture for storing and manipulating a collection of objects. In JDK 1.2, a new framework called "Collection Framework" was created, which contains all of the collection classes and interfaces. Collections in Java are capable of doing any data operations such as searching, sorting, insertion, manipulation, and deletion. A single unit of objects in Java is referred to as a collection. The two basic “root” interfaces of Java collection classes are the Collection interface (java.util.Collection) and the Map interface(java.util.Map). Many interfaces (Set, List, Queue, Deque) and classes are available in the Java Collection framework (ArrayList, Vector, LinkedList, PriorityQueue, HashSet, LINKEDHASHSET, TreeSet). Need for the Collection framework:- Prior to the introduction of Collection Framework (or JDK 1.2), the standard techniques for aggregating Java objects (or collections) were Arrays, Vectors, or Hash TABLES. There was no common interface for all of these collections. As a result, while the basic goal of all the collections is the same, their implementation was specified independently and there was no correlation between them. FURTHERMORE, USERS find it challenging to remember all of the various methods, syntax, and constructors included in each collection class.

What is Collection in Java?

Answer»

In Java, a collection is a FRAMEWORK that provides an architecture for storing and manipulating a collection of objects. In JDK 1.2, a new framework called "Collection Framework" was created, which contains all of the collection classes and interfaces.

Collections in Java are capable of doing any data operations such as searching, sorting, insertion, manipulation, and deletion.

A single unit of objects in Java is referred to as a collection. The two basic “root” interfaces of Java collection classes are the Collection interface (java.util.Collection) and the Map interface(java.util.Map). Many interfaces (Set, List, Queue, Deque) and classes are available in the Java Collection framework (ArrayList, Vector, LinkedList, PriorityQueue, HashSet, LINKEDHASHSET, TreeSet).

Need for the Collection framework:-

Prior to the introduction of Collection Framework (or JDK 1.2), the standard techniques for aggregating Java objects (or collections) were Arrays, Vectors, or Hash TABLES. There was no common interface for all of these collections. As a result, while the basic goal of all the collections is the same, their implementation was specified independently and there was no correlation between them. FURTHERMORE, USERS find it challenging to remember all of the various methods, syntax, and constructors included in each collection class.

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