Java Collections | Collections Framework in Java | Java Tutorial For Beginners | Edureka
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**** Java Certification Training: https://www.edureka.co/java-j2ee-soa-training **** This Edureka tutorial on “Java Collections” will talk about the complete hierarchy of Collections Frameworks in Java. It will walk you through the various fundamentals of collections like Lists, Queue, Sets, Interfaces etc. Through this tutorial you will learn the following topics: Java Collection Framework Collection Framework Hierarchy Interfaces List Queue Set Check out our Java Tutorial blog series: https://goo.gl/osrGrS Check out our complete Youtube playlist here: https://goo.gl/gMFLx3
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Java Collections | Collections Framework in Java | Java Tutorial For Beginners | Edureka
- 2. Topics for Today’s Session JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Java Collection Framework Interfaces Queue Collection Framework Hierarchy List Set
- 4. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Java Collection Framework It provides an architecture to store and manipulate a group of objects Using Java Collections various operations can be performed on the data like searching, sorting, insertion, manipulation, deletion, etc. Java Collection framework provides many interfaces and classes Collections are the containers that groups multiple items in a single unit 01 02 03 04
- 6. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Collection Framework Hierarchy Iterable Collection Queue Set ArrayList LinkedList Vector Deque SortedSet TreeSet List ArrayDeque PriorityQueue HashSet LinkedHashSet Interface Class Extends Implements Stack
- 7. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Collection Framework Hierarchy Iterable Collection Queue Set ArrayList LinkedList Vector Deque SortedSet TreeSet List Stack ArrayDeque PriorityQueue HashSet LinkedHashSet Interface Class Extends Implements Map HashMap SortedMap HashTable TreeMap
- 9. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Interface Interfaces are the reference types which are similar to classes but contains only abstract methods Interface cannot be instantiated Contains only abstract methods An interface can extend multiple interfaces Interface is implemented by a class Interface do not contain constructors or instance fields
- 10. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Interface Iterable The Iterable interface is the root interface for all the collection classes. The Collection interface along with all its subclasses also implement the Iterable interface. Methods Iterator<T> iterator() Collection Collection interface is implemented by all the classes in the collection framework & declares the methods that every collection will contain Methods Boolean add(Object obj) Iterator The Iterator interface provides the facility of iterating the elements only in a forward direction. Methods public boolean hasNext() public Object next() public void remove() Boolean addAll(Object obj) void clear() ...
- 11. Java Lists
- 12. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training LinkedListVector Java List Java List is an interface that extents the Collection and contains ordered collection of elements including duplicate values ArrayListList Types
- 13. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training LinkedList Java List ArrayList Vector ArrayList is the implementation of List Interface where the elements can be dynamically added or removed from the list The size of the list is increased dynamically if the elements are added more than the initial size 0 1 2 3 4 5 ArrayList object = new ArrayList ();
- 14. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training LinkedList Java List ArrayList Vector java.utils.ArrayList boolean add(Collection c) void add(int index, Object element) void clear() Object[] toArray() void trimToSize() Object clone()int lastIndexOf(Object o)
- 15. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training LinkedList Java List ArrayList Vector Linked List is a sequence of links which contains items Linkedlist object = new Linkedlist(); Singly Linked List Doubly Linked List Each link contains a connection to another link
- 16. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training LinkedList Java List ArrayList Vector Singly Linked List Doubly Linked List Each node in this list stores the data of the node and a pointer or reference to the next node in the list Prev Next Prev Next Prev Next NULL HEAD
- 17. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training LinkedList Java List ArrayList Vector Singly Linked List Doubly Linked List Doubly Linked list has two references: one to the next node and another to previous node Next NULL HEAD NodePrev NextNodePrev NextNodePrev
- 18. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training LinkedList Java List ArrayList Vector Java.util.Linkedlist boolean add(Object c) boolean contains(Object o) void add (int index, Object element) int indexOf(Object element) int lastIndexOf(Object element) void addLast(Object o)void addFirst(Object o) int size() boolean remove(Object o)
- 19. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training LinkedList Java List ArrayList Vector Vectors are similar to arrays, where the elements of the vector object can be accessed via an index into the vector Vector implements a dynamic array and is not limited to a specific size and is synchronized Vector object = new Vector(size,increment); 0 1 2 3 4 5
- 20. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training LinkedList Java List ArrayList Vector Java.util.Vectors boolean add(Object c) void add (int index, Object element) int indexOf(Object element) int lastIndexOf(Object element) boolean contains(Object element) void clear() int size() boolean remove(Object o)
- 21. Java Queue
- 22. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Java Queue 0 1 2 3 … … … n Insert Remove Rear Front Queue in Java follows a FIFO approach i.e. it orders the elements in First In First Out manner The first element is removed first and last element is removed in the end Queue<Integer> q = new LinkedList<>();
- 23. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Java Queue Java.util.Queue boolean add(object) boolean offer(object) Object poll()Object remove() Object element() Object peek()
- 24. Java Set
- 25. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Java Sets A Set refers to a collection that cannot contain duplicate elements It is mainly used to model the mathematical set abstraction LinkedHashSet TreeSet HashSet Set has its implementation in various classes
- 26. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Java Sets LinkedHashSet TreeSet HashSet Java HashSet class creates a collection that use a hash table for storage Hashset only contain unique elements and it inherits the AbstractSet class and implements Set interface It uses a mechanism hashing to store the elements HashSet<String> al= new HashSet();
- 27. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Java Sets LinkedHashSet TreeSet HashSet Java.util.HashSet boolean add(Object c) boolean contains(Object o) Iterator iterator() Object clone() boolean isEmpty()void clear() int size() boolean remove(Object o)
- 28. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Java Sets LinkedHashSet TreeSet HashSet Java LinkedHashSet class is a Hash table and Linked list implementation of the set interface It contains only unique elements It provides all optional set operations and maintains insertion order LinkedHashSet<String> al=new LinkedHashSet(); This class inherits methods from other classes AbstractCollection Object Set HashSet AbstractSet
- 29. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Java Sets LinkedHashSet TreeSet HashSet TreeSet class implements the Set interface that uses a tree for storage The objects of this class are unique and are stored in the ascending order It inherits AbstractSet class and implements NavigableSet interface TreeSet<String> al=new TreeSet<String>();
- 30. JAVA CERTIFICATION TRAINING www.edureka.co/java-j2ee-soa-training Java Sets LinkedHashSet TreeSet HashSet Java.util.TreeSet boolean addAll(Collection c) boolean contains(Object o) boolean isEmpty() Object last() int size() void clear()boolean remove(Object o) Object clone() Object first() void add(Object o)