Back to notes -- Keyboard shortcut: 'u'  previous -- Keyboard shortcut: 'p'  next -- Keyboard shortcut: 'n'  Slide program -- Keyboard shortcut: 't'    The class HighScoreList.Lecture 1 - slide 22 : 22
Program 5
abstract class HighScoreList {

  /* Invariant: Entries always sorted */

  public abstract void Open(string FileName);

  public abstract string Count{
    get;
  }

  public abstract HighScoreEntry this[int i]{
    get;
  } 

  public abstract void Add(HighScoreEntry e);

  public abstract void Close();

}