LinkedList - printing non-repeated occurrences

Question

I have to read some data from a file. Each line is in the following format: ID_number;Name;address.
Store it and then print all the occurrences that are not repeated.
If the file had the following lines:
+12345;John;California+ <-- repeated ID
+3243243;Marie;Mars+
+12345;Jane;Madrid+ <--- repeated ID
+4344444;Jill;US+
I would print:
+3243243;Marie;Mars+
+4344444;Jill;US+
Since I don't know how many lines the file has I was thinking about using a LinkedList to store the values
instead of an array but I do not know of any efficient way to remove the repeated occurrences or just print
the non-repeated.
I'm quite new to Java. If someone could point me in the right direction I would appreciate it.

Answer 1

This is how I did it. Works but I am not sure if it is the best way to do it.
import java.util.LinkedList;
public class TestFile {
     public static void main(String[] args) {
          LinkedList<String> llist = new LinkedList<String>();
          llist.add("23167;sadas sd d;asdasd Dfffd");
          llist.add("12345;sdas s sd;asd sd sasd");          // repeated
          llist.add("443324;sadasd;Asdasd");
          llist.add("12345;sGadasd;Asdd sd ssad");          // repeated
          String[] v = llist.toArray(new String[0]);          // LinkedList to Array
          boolean dupFound = false;
          // sets repeated occurrences to null
          for (int i = 0; i < v.length - 1; i++) {
               dupFound = false;
               if (v[i] != null) {
                    for (int j = i + 1; j < v.length; j++) {
                         if (v[j] != null && v.split(";")[0]
                         .equals(v[j].split(";")[0])) {
                              v[j] = null;
                              dupFound = true;
                    } //inner for
                    if (dupFound) {
                         v[i] = null;
          } //outer for
          // print non-repeated occurrences
          for (int i = 0; i < v.length; i++)
               if (v[i] != null)
                    System.out.println(v[i]);
     } //end main
} //end classBeen reading about Sets through that link and the API. Still no clue of which path to
follow. I'll try googling a bit to see if I can get enlighted.
Thank you for the help.