Question

Create a linked list of Poem objects using the Poem.java file provided. You may create Poem objects by hard coding (minimum 4), reading from a file, or getting user input.

Print the list using ListIterator.

Here is Poem.Java:

public class Poem
{

   private String title;
   private String poet;

   /**
   * No arg constructor
   */
   public Poem()
   {
       title = "not set";
       poet = "not set";
   }

   /**
   * @param title
   * @param poet
   */
   public Poem(String title, String poet)
   {
       super();
       setTitle(title);
       setPoet(poet);
   }

   /**
   * @return the title
   */
   public String getTitle()
   {
       return title;
   }

   /**
   * @param title the title to set
   */
   public void setTitle(String title)
   {
       if (title.length() > 0)
       {
           this.title = title;
       } else
       {
           this.title = "not set";
       }
   }

   /**
   * @return the poet
   */
   public String getPoet()
   {
       return poet;
   }

   /**
   * @param poet the poet to set
   */
   public void setPoet(String poet)
   {
       if (poet.length() > 0)
       {
           this.poet = poet;

       } else
       {
           this.poet = "not set";
       }
   }

   @Override
   public String toString()
   {
       return "Poem [title=" + title + ", poet=" + poet + "]";
   }

}

Answer 1

//The code and output both have been provided in case of any doubts please do comment..

import java.util.LinkedList;
import java.util.ListIterator;

public class Poems {

    public static void main(String[] args) {
        //Initializing a Linked List of Poem Object
        LinkedList<Poem> poems = new LinkedList<Poem>();

        //Adding the various Poems to poems Linked List
        poems.add(new Poem("The Good Life", "Tracy K. Smith"));
        poems.add(new Poem("How Bright It Is", "Brian Turner"));
        poems.add(new Poem("Numbers", "Mary Cornish"));
        poems.add(new Poem("The Road Not Taken", "Robert Frost"));
        poems.add(new Poem("Daffodils", "William Wordsworth"));
        poems.add(new Poem("Sonnet 18", "William Shakespeare"));
        poems.add(new Poem("A Psalm Of Life", "Henry Wadsworth Longfellow"));

        //Declaration and initialization of list iterator to iterate over poems
        ListIterator<Poem> iterator = poems.listIterator();
        System.out.println("=========================");
        //It iterates until next is not null
        while (iterator.hasNext()){
            //Store current poem index in current Poem and iterate to next poem
            Poem currentPoem = iterator.next();
            System.out.println("The current poem is \"" + currentPoem.getTitle() + "\" and its author is \"" + currentPoem.getPoet() + "\"");
        }
        System.out.println("=========================");

    }

}