✓The collection in java is a framework that provides an architecture to store and manipulate the group of objects.
✓ collection framework is a group of classes and interfaces which are used to manage different types of collections.
✓ collections as a big set of inbuilt methods to perform basic operations such as add,remove, search,sorting etc.
✓java.util contains all the classes and interfaces for the collection framework.
✓ Every collection as at least one underlying data structure.
✓ collections are global in nature. The size of a collection can be changed dynamically at runtime.
✓ Below are the few inbuilt methods present in collection interface.
1. public boolean add(E e) -> to insert an element.
2. public boolean remove(Object e)-> to delete an element.
3. public boolean removeAll(Collection<?> c)->to delete all the elements of specified collection.
4. public int size() -> It returns the total number of elements in the collection.
✓ Below are the inbuilt methods present in Iterator interface.
1. public boolean hasNext()
2. public Object next()-> It returns the elements and move the cursor to next element.