How do I remove repeated elements from ArrayList?

Question

I have an ArrayList, and I want to remove repeated strings from it. How can I do this?

Answer 1

    ArrayList list = new ArrayList();
    HashSet unique = new LinkedHashSet();
    HashSet dup = new LinkedHashSet();
    boolean b = false;
    list.add("Hello");
    list.add("Hello");
    list.add("how");
    list.add("are");
    list.add("u");
    list.add("u");

    for(Iterator iterator= list.iterator();iterator.hasNext();)
    {
        String value = (String)iterator.next();
        System.out.println(value);

        if(b==unique.add(value))
            dup.add(value);
        else
            unique.add(value);


    }
    System.out.println(unique);
    System.out.println(dup);