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Key facts about Linkedlist
·  LinkedList can have duplicate and null values.·  The LinkedList class implements Queue and Deque interfaces. Therefore, It can also be used as a Queue, Deque or Stack.
·  Java LinkedList is not thread-safe. You must explicitly synchronize concurrent modifications to the LinkedList in a multi-threaded environment.·  Java LinkedList maintains the insertion order of the elements.
Linkedlist Example:import java.util.*; public class LinkedListExample {      public static void main(String args[]) {          /* Linked List Declaration */        LinkedList<String> testlist = new LinkedList<String>();          /*add(String Element) is used for adding         * the elements to the linked list*/        testlist.add("Item1");        testlist.add("Item5");        testlist.add("Item3");        testlist.add("Item6");        testlist.add("Item2");          /*Display Linked List Content*/        System.out.println("Linked List Content: " + testlist);          /*Add First and Last Element*/        testlist.addFirst("First Item");        testlist.addLast("Last Item");        System.out.println("LinkedList Content after addition: " + testlist);          /*This is how to get and set Values*/        Object firstvar = testlist.get(0);        System.out.println("First element: " +firstvar);        testlist.set(0, "Changed first item");        Object firstvar2 = testlist.get(0);        System.out.println("First element after update by set method: " +firstvar2);          /*Remove first and last element*/        testlist.removeFirst();        testlist.removeLast();        System.out.println("LinkedList after deletion of first and last element: " + testlist);          /* Add to a Position and remove from a position*/        testlist.add(0, "Newly added item");        testlist.remove(2);        System.out.println("Final Content: " + testlist);                /* Access specific element in the Linkedlist*/        testlist.indexOf(“Newly added item”);        /*Iterator for Linkedlist*/        Iterator<String> testlistIterator = testlist.iterator();         while (testlistIterator.hasNext()) {             String speciesName = testlistIterator.next();             System.out.println(speciesName);         }
Applications of linked list in real world- Image viewer – Previous and next images are linked, hence can be accessed by next and previous button. Previous and next page in web browser – We can access previous and next url searched in web browser by pressing back and next button since, they are linked as linked list. Music Player – Songs in music player are linked to previous and next song. you can play songs either from starting or ending of the list.