public class StringList { 
    private LinkedList v = new LinkedList(); 
    private Iterator iterator = new StringListIterator(); 

    //add a new string at the end
    public void add(String s) { v.add(s); }

    //get the i-th string 
    public String get(int i){ return (String) v.get(i); } 

    //remove and return the i-th string 
    public String remove(int i){ return (String)v.remove(i);} 

    //return the number of strings in the list 
    public int size(){return v.size(); }
 
    //return an iterator over the list
    public java.util.Iterator iterator() { return iterator; } 

    //inner class
    class StringListIterator implements java.util.Iterator { 
        int count = size(); 
        
        public boolean hasNext() { return count > 0; } 

        public Object next() { 
            if (count == 0) 
                throw new 
                    java.util.NoSuchElementException("StringList"); 
            return v.get(--count); 
        } 

        public void remove() {
            throw new UnsupportedOperationException();
        }    
    } 
}