public class IntList{
    private IntLink head;
       
    /** create an empty list
     */
    public IntList(){
    }

    /** Return a reference to the first link in the list.
        @return reference to first link in List.
    */
    public IntLink getHead(){}

    /** Insert a new integer at the head of a list.
        @param newNumber integer to insert.
     */

    public void insertAtHead(int newNumber){
    }
}