7 LabVIEW编程面向对象编程之设计模式一.pdf

LabVIEW编程：面向对象编程之设计模式一 刘亮 设计模式一 策略模式 观察者模式 策略模式 Strategy Pattern/Policy Pattern 软件开发中的“常数”在何处工作 开发什么项目 使用何种编程语言 修改 无论您的应用程序设计的有多好，如果没有任何改进，久而久之它将被淘汰 策略模式 Duck quack()swim()display()/Other duck-like methods Mallard Duck display()/looks like mallard Redhead Duck display()/looks like redhead 类 策略模式 Duck quack()swim()display()/Other duck-like methods Mallard Duck display()/looks like mallard Redhead Duck display()/looks like redhead 继承 策略模式 Duck quack()swim()display()/Other duck-like methods Mallard Duck display()/looks like mallard Redhead Duck display()/looks like redhead 抽象方法 动态分配 策略模式 Duck quack()swim()display()/Other duck-like methods Mallard Duck display()/looks like mallard Redhead Duck display()/looks like redhead 实现 fly()Duck quack()swim()display()/Other duck-like methods Duck quack()swim()display()fly()/Other duck-like methods 策略模式 Mallard Duck display()/looks like mallard Redhead Duck display()/looks like redhead 新增行为 Duck quack()swim()display()fly()/Other duck-like methods 策略模式 Mallard Duck display()/looks like mallard Redhead Duck display()/looks like redhead Rubber Duck display()/rubber duck 橡皮鸭子不能飞 display()/rubber duck Rubber Duck display()/rubber duck fly()/override to do nothing Duck quack()swim()display()fly()/Other duck-like methods 策略模式 Mallard Duck display()/looks like mallard Redhead Duck display()/looks like redhead 重写方法 继承 继承的一种重要用途是实现代码的重用 display()/rubber duck fly()/override to do nothing Rubber Duck Duck quack()swim()display()fly()/Other duck-like methods 策略模式 Mallard Duck display()/looks like mallard Redhead Duck display()/looks like redhead quack()/override to do nothing display()/decoy duck fly()/override to do nothing Decoy Duck 重复继承 新增继承 继承不易维护 display()/rubber duck Rubber Duck Duck swim()display()/Other duck-like methods 策略模式 Mallard Duck display()/looks like mallard Redhead Duck display()/looks like redhead display()/decoy duck Decoy Duck Flyable fly()Quackable quack()策略模式 设计原则一 Duck Behaviors 策略模式 设计原则二 fly()Fly Behavior fly()/implements duck flying Fly with Wings fly()/do nothing cant fly!Fly No Way 策略模式 quack()Quack Behavior quack()/implements duck quacking Quack quack()/rubber duckie squeak Squeak quack()/do nothing cant quack!Mute Quack 策略模式 Duck Fly Behavior Quack Behavior Duck Behaviors performQuack()swim()display()perfomFly()/Other duck-like methods fly()quack()策略模式 Strategy Pattern/Policy Pattern 观察者模式 Observer Pattern 观察者模式 订阅用户 观察者模式 订阅用户 观察者模式 订阅用户 观察者模式 订阅用户 观察者模式 订阅用户 观察者模式 National Instruments Price Symbol Update()Investor Investor()Send Data()Investor()观察者模式 National Instruments Price Symbol Update()IObserver Send Data()Investor()Investor Investor()Send Data()观察者模式 National Instruments Price Symbol Add Observer()Remove Observer()Update()IObserver Send Data()Investor()Investor Investor()Send Data()观察者模式 Stock Price Symbol Add Observer()Remove Observer()Update()IObserver Send Data()Investor()Investor Investor()Send Data()National Instruments Update()观察者模式 Observer Pattern 更多技术资源下载 GSDZ 敬请进入下一环节