public void CreateThreeInstanceThenDesplay()
 {
     AbstractDisplay aDisp1 = new CharDisplay ('H');
     AbstractDisplay aDisp2 = new StringDisplay ("Hello, CSharp!");
     AbstractDisplay aDisp3 = new StringDisplay ("Hello, Template Method.");
     aDisp1.Display ();
     aDisp2.Display ();
     aDisp3.Display ();
 }
 public void InitializeWithStringThenDisplay()
 {
     AbstractDisplay disp = new StringDisplay ("Hello World");
     disp.Display ();
 }