LinkedList

Looks good so far. You can use a do-while loop to cut out a bit of code.

Does that work? Am I correct in assuming you just need to add the duplication check?

Algo -

response = "YES"
while(response != null && response.equals("YES"))
{
     -> read the data for the first time
        System.out.print("Input name:");
                  names = dataIn.readLine();
    -> ask question for response
}

That should do the trick.

What have you done so far for the search??

You can first store these values in HashSet and then in Linked List.
HashSet automatically removes the duplicate values, so you won't be required to write a code to remove the duplicacy.

Let me know if this helps

You can use

while (response != null && response.equalsIgnoreCase("YES"))

although it's perhaps slightly clunky to keep requiring YES. Ask them to enter 0 when they've finished or something.

To avoid duplicates, use

if (!IList.contains(names)) {
      IList.add(names);
}

although 'name' would be a better name here. btw, java variable names should begin lower case. Something like the following would be better:

if (!names.contains(name)) {
      names.add(name);
}

How do i do the search method and its still allowing duplicate names. thanks

alepru: As suggested above, in my earlier post, you can use HashSet (from Java Collection Framework) to store the values first (you can convert into lowercase if the you don't want case-insensitive duplicacy).

Being the subset of Set class (interface), one of the HashSet property is to remove the duplicate elements. This process of removing the duplicacy happens as and when you are adding elements into the Hashset.

Let me know if using HashSet is not an option

You could also use a ArrayList and check whether the object is already there using the contains() method to check for duplicates.

>>How do i do the search method and its still allowing duplicate names. thanks

Did you use the code i gave you at http:#25737263 ?

To search, use

int index = names.indexOf("foo");
if  (index > -1) {
    // found!
}

Savant,
Thank You..I have used both codes, they both work. The only problem now is that it won't show me the list off all the names entered. It just shows the last name entered.

Please post the code you're currently running

import java.io.*;
import java.util.ListIterator;
import java.util.LinkedList;

public class llist
{
      public static void main(String[] args)throws IOException
      {
            BufferedReader dataIn=new BufferedReader(new InputStreamReader(System.in));
            //create LinkedList object
            LinkedList lList = new LinkedList();
            String names="";
            String response="";

            System.out.print("");
            System.out.print("Input a name:");
            names = dataIn.readLine();

            System.out.print("Would you like to enter another name? Enter yes or press any key to exit.");
            response = dataIn.readLine();
            if (response != null)
            {
                  response = response.toUpperCase();
            }

            while (response != null && response.equals("YES"))
            {


                  System.out.print("Input name:");
                  names = dataIn.readLine();
                  System.out.print("Would you like to enter another name? Enter yes or press any key to exit.");
                  response = dataIn.readLine();
                  if (response != null)
                  {
                        response = response.toUpperCase();
                  }
            }

            if (lList.contains(names))
            {
                  lList.add(names);
            }

            int index = names.indexOf("Aleona, Alex, Emilie, Johnny");
            if  (index > -1)
            {
                // found!
            }


            System.out.println("This is the list of names entered:");
            System.out.println("");


            lList.add(names);
            ListIterator itr = lList.listIterator();

            while(itr.hasNext())
            {
                  System.out.println(itr.next());
            }

            System.out.println("");

      }

}

while (response != null && response.equals("YES"))
            {


                  System.out.print("Input name:");
                  names = dataIn.readLine();
              if (lList.contains(names)==false)
            {
                  lList.add(names);
            }
                  System.out.print("Would you like to enter another name? Enter yes or press any key to exit.");
                  response = dataIn.readLine();
                  if (response != null)
                  {
                        response = response.toUpperCase();
                  }
            }