Set.java

//Mnozica
 
public interface Set {
  public abstract void makenull()  ;
  public abstract Object first() ;
  public abstract Object next(Object pos) ;
  public abstract void insert(Object x) ;
  public abstract void delete(Object pos) ;
  public abstract boolean overEnd(Object pos) ;
  public abstract boolean empty() ;
  public abstract Object retrieve(Object pos) ;
  public abstract Object locate(Object x) ;
  public abstract void union(Set a) ;
  public abstract void intersection(Set a) ;
  public abstract void printSet() ;
}