package biduledres;

import java.util.*;

public class ListeSommetPrimitif extends LinkedHashSet {
    public boolean contains(Object o) {
        Iterator i = iterator();
        while(i.hasNext())
            if (o.equals(i.next())) return true;
        return false;
    }
    
    public boolean add(Object o) {
        if (!contains(o)) return super.add(o);
        return false;
    }
    
    
    
}