Slip 20 - B) Construct a Linked List containing name: CPP, Java, Python and PHP. Then extend your java program to do the following: i. Display the contents of the List using an Iterator ii. Display the contents of the List in reverse order using a ListIterator.

Solution :

import java.util.*;

    public class Slip20B{

        public static void main (String args[]){

            LinkedList al = new LinkedList<>();

            al.add("CPP");

            al.add("JAVA");

            al.add("Python");

            al.add("PHP");

            System.out.println("Display content using Iterator...");

            Iterator il=al.iterator();

            while(il.hasNext()){

                System.out.println(il.next());

            }

            System.out.println("Display Content Revverse Using ListIterator");

            ListIterator li1=al.listIterator();

            while(li1.hasNext()){

                li1.next();

            }

            while(li1.hasPrevious()){

                System.out.println("" + li1.previous());

            }

        }

    }

Output: