Question

Write a program using LinkedList class and ListIterator interface to demonstrate the following activities:

Answer 1

The program is an illustration of LinkedList.

What is a LinkedList?

A LinkedList is a data structure element that contains nodes where each node represents a value and also points to the next node.

The main program

The program written in Java, where comments are used to explain each line of the program is as follows:

import java.util.LinkedList;

import java.util.Iterator;

class Main {

 public static void main(String[] args) {

     //This creates the Alphabets LinkedList

   LinkedList<String> Alphabets = new LinkedList<String>();

   //This creates an iterator for the Alphabets LinkedList

   Iterator it = Alphabets.iterator();

   //This adds P, Q, R and T to the list

   Alphabets.add("P");    Alphabets.add("Q");    Alphabets.add("R");    Alphabets.add("T");

   //This prints the Alphabets LinkedList

   System.out.println(Alphabets);

   //This adds O to the beginning of the list

   Alphabets.addFirst("O");

   //This prints the Alphabets LinkedList

   System.out.println(Alphabets);

   //This adds U to the list

   Alphabets.add("U");

   //This prints the Alphabets LinkedList

   System.out.println(Alphabets);

   //This adds S after R

   Alphabets.add(4,"S");

   //This prints the Alphabets LinkedList

   System.out.println(Alphabets);

   //This removes O and Q from the list

   Alphabets.remove("O"); Alphabets.add("Q");

   //This prints the Alphabets LinkedList

   System.out.println(Alphabets);

 }

}

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