Class which implements iterator interface

public class SportCarHouse implements CarIterator {

      List sportsCars;
      public List getCars() 
      {
            return sportsCars;
      }
      public Iterator createIterator() 
      {
            return sportsCars.iterator();
      }
}

C:\Documents and Settings\20818781\Desktop\Pattern_iterator\SportCarHouse.java:4: cannot find symbol
symbol  : class List
location: class SportCarHouse
      List sportsCars;
      ^
C:\Documents and Settings\20818781\Desktop\Pattern_iterator\SportCarHouse.java:19: cannot find symbol
symbol  : class List
location: class SportCarHouse
      public List getCars()
             ^
2 errors