public ModelDuck()
{
QuackBehavior = new LoudQuack();
FlyBehavior = new FlyNoWay();
}
public ModelDuck()
{
flyBehavior = new FlyWithWings();
quackBehavior = new LoudQuack();
}
public MallardDuck()
{
QuackBehavior = new LoudQuack();
FlyBehavior = new FlyWithWings();
}