public DecoyDuck()
{
flyBehaviour = new FlyNoWay();
quackBehaviour = new MuteQuack();
}
public ModelDuck()
{
flyBehaviour = new FlyNoWay();
quackBehaviour = new Quack();
}
public RubberDuck()
{
flyBehaviour = new FlyNoWay();
quackBehaviour = new Squeak();
}