It is used to insert an element in this collection. There are many methods declared in the Collection interface. The java.util package contains all the classes and interfaces for the Collection framework. Let us see the hierarchy of Collection framework.
What is the difference between Java collection and Java collections?. How can we sort the elements of an object? What is the difference between Comparable and Comparator interfaces?. What is the difference between Iterator and Enumeration interface in collection framework?. What is the difference between HashMap and Hashtable class?. What is the difference between HashSet and HashMap classes in collection framework?. What is the difference between ArrayList and Vector classes in collection framework?. What is the difference between ArrayList and LinkedList classes in collection framework?. What are the two ways to iterate the elements of a collection?. Interfaces and its implementations, i.e., classes. 
The Collection framework represents a unified architecture for storing and manipulating a group of objects.
It represents a set of classes and interfaces. What is Collection in JavaĪ Collection represents a single unit of objects, i.e., a group. Java Collection framework provides many interfaces (Set, List, Queue, Deque) and classes ( ArrayList, Vector, LinkedList, PriorityQueue, HashSet, LinkedHashSet, TreeSet). 
Java Collection means a single unit of objects. Java Collections can achieve all the operations that you perform on a data such as searching, sorting, insertion, manipulation, and deletion. The Collection in Java is a framework that provides an architecture to store and manipulate the group of objects.
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