public DecoyDuck()
 {
     flyBehavior   = new FlyNoWay();
     quackBehavior = new MuteQuack();
 }
 public RubberDuck()
 {
     flyBehavior   = new FlyNoWay();
     quackBehavior = new Squeak();
 }
 public ModelDuck()
 {
     flyBehavior   = new FlyNoWay();
     quackBehavior = new NormalQuack();
 }