Duplicate

import java.util.ArrayList;
import java.util.List;

public class Duplicate {
  public static void main(String[] args) {
    String[] ss = {"b", "b", "a", "a", "c", "c"};
    List<String> ls = new ArrayList<String>();
    for (int i = 0; i < ss.length; i++)
      ls.add(ss[i]);
    String prev = ls.iterator().next();
    List<String> ret = new ArrayList<String>();
    ret.add(prev);
    for (String e: ls) {
      if (!prev.equals(e)) ret.add(e);
      prev = e;
    }
    System.out.println(ret);
  }
}