C# (CSharp) App2 Quack示例

示例#1

 public MallardDuck()
 {
     quackBehavior = new Quack();
     flyBehavior   = new FlyWithWings();
 }

示例#2

 public ModelDuck()
 {
     flyBehavior   = new FlyNoWay();
     quackBehavior = new Quack();
 }