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Java basics

LinkedList


The LinkedList class extends AbstractSequentialList and implements the List interface. It provides a linked-list data structure

Syntax:
LinkedList ll = new LinkedList();


Example:

import java.util. LinkedList;

public class LinkedListDemo {

   public static void main(String args[]) {
      // create a linked list
      LinkedList ll = new LinkedList();
      // add elements to the linked list
      ll.add("F");
      ll.add("B");
      ll.add("D");
      ll.add("E");
      ll.add("C");
      ll.addLast("Z");
      ll.addFirst("A");
      ll.add(1, "A2");
      System.out.println("Original contents of ll: " + ll);

      // remove elements from the linked list
      ll.remove("F");
      ll.remove(2);
      System.out.println("Contents of ll after deletion: "
       + ll);
      
      // remove first and last elements
      ll.removeFirst();
      ll.removeLast();
      System.out.println("ll after deleting first and last: "
       + ll);

      // get and set a value
      Object val = ll.get(2);
      ll.set(2, (String) val + " Changed");
      System.out.println("ll after change: " + ll);
   }
}


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