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A Java collection is a framework that provides an architecture for storing and manipulating a set of objects. Java Collections can perform all data operations like searching, sorting, inserting, manipulating and deleting. A collection in Java represents a single entity of objects. The Java Collection Framework provides many interfaces (Set, List, Queue, Deque) and classes (ArrayList, Vector, LinkedList, PriorityQueue, HashSet, LinkedHashSet, TreeSet). What is a collection in Java? A collection represents a single entity of objects, i.e. a group. What is a Framework in Java? It offers an out-of-the-box architecture. Represents a set of classes and interfaces. It is not mandatory. What is a framework collection? A framework collection is a unified architecture for storing and manipulating a set of objects. It has: Interfaces and their implementations, e.g. B. Class Algorithm Did you know? What are two ways to iterate through the items in a collection? What is the difference between ArrayList and LinkedList classes in Collection? What is the difference between ArrayList and Vector classes in Collection? What is the difference between HashSet and HashMap classes in Collection? What is the difference between HashMap and Hashtable class? What is the difference between an iterator and an enumeration in a collection? How can we arrange the elements of an object? What is the difference between compare and contrast interfaces? What does the hashcode() method do? What is the difference between Java Collection and Java Collections? Collection Framework Hierarchy Lets take a look at the collection framework hierarchy. The java.util package contains all classes and interfaces of the collection platform. Collection Interface Methods Many methods are declared in the Collection interface. They are as follows: No. Method Description 1 public Boolean add(E e) Used to add an item to this collection. 2 public puzzlesExtended E> c) Used to move the specified items of a collection into the calling collection. 3public boolean remove(object element) Used to remove an element from the collection. 4public boolean removeAll(Collection<?> c) Used to remove all items of the specified collection from the calling collection. 5default boolean removeIf(Predicate<? super E> filter) Used to remove all elements of the collection that match the specified predicate. 6public boolean retenAll(Collection<?> c) Used to remove all elements of the calling collection except the specified collection. 7public int size() Returns the total number of items in the collection. 8public void clear() Removes the total number of items from the collection. 9public boolean content(Element Object) Used to find the element. 10public boolean contentAll(Collection<?> c) Used to search within the collection for the specified collection. 11public Iterator iterator() Returns an iterator. 12public Object toArray() Converts a collection to an array. 13public <T> T toArray(T a) Converts a collection to an array. The runtime type of the array returned here is the runtime type of the specified array. 14public boolean isEmpty() Checks if the collection is empty. 15default Stream<E> parallelStream() Returns a possibly parallel stream sourced from a Collection. 16default Stream<E> stream() Returns a serial stream sourced from a collection. 17default Spliterator<E> spliterator() Creates a separator for the specified items in the collection. 18public boolean equals(object element) Matches two collections. 19public int hashCode() Returns the hash code number of the collection. Iterator Interface The iterator interface provides the ability to iterate elements forward only. Iterator Interface Methods The Iterator interface has only three methods. You: No. MethodDescription 1public boolean hasNext() returns true ifan iterator has multiple elements, otherwise it returns false. 2public Object next() Returns an element and moves the cursor to the next element. 3public void remove() Removes the last items returned by the iterator. It is used less. The Iterable Interface The Iterable interface is the root interface for all Collection classes. The Collection interface extends the Iterable interface so that all subclasses of the Collection interface also implement the Iterable interface. Contains only one abstract method. ie Iterator<T> iterator() Returns an iterator over elements of type T. Collection Interface The collection interface is the interface implemented by all classes in the collection system. It declares the methods each collection will have. In other words, we can say that the collection interface is the foundation on which the collection system rests. Some of the collection interface methods are boolean add(Object obj), boolean addAll(Collection c), void clear() etc. which are implemented by all collection interface subclasses. List interface The List interface is a subinterface of the Collection interface. This prevents a list-like data structure in which we can store an ordered collection of objects. Can have duplicate values. The List interface is implemented by the ArrayList, LinkedList, Vector, and Stack classes. To create the List interface, we need to use: List <data type> list1= new ArrayList(); List <data type> list2 = new LinkedList(); list <data type> list3 = new vector(); List <data type> list4 = new Stack(); The list interface has various methods that can be used to insert, remove, and access list items. Below are the classes that implement the List interface. ArrayList The ArrayList class implements the List interface. Uses a dynamic array to store duplicate elements of different data types. The ArrayList class preserves the insertion order and is

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