設計模式-筆記01

2019-11-11 01:47:02

字體：大中小

來源：轉載

供稿：網友

1.9 緊耦合vs松耦合

public class Operation{ PRivate double _numberA=0; private double _numberB=0; public double NumberA { get{ return _numberA;} set{ _numberA = value;} } public double NumberB{ get{ return _numberB;} set{_numberB = value;} } public virtual double GetResult(){ double result =0; return result; }}class OperationAdd:Operation // 加法類繼承運算類{ public override double GetResult() { double result =0; result = NumberA+NumberB; return result; }}class OperationSub:Operation // 減法類繼承運算類{ public override double GetResult() { double result =0; result = NumberA - NumberB; return result; }}class OperationMul:Operation // 乘法類繼承運算類{ public override double GetResult() { double result =0; result = NumberA * NumberB; return result; }}class OperationDiv:Operation // 除法類繼承運算類{ public override double GetResult() { double result =0; if(NumberB==0){ throw new Exception("除數不能為0"); result = NumberA / NumberB; return result; } }}public class OperationFactory{ public static Operation createOperation(string operate){ Operation oper = null; switch(operate){ case "+": oper = new OperationAdd(); break; case "-": oper = new OperationSub(); break; case "*": oper = new OperationMul(); break; case "/": oper = new OperationDiv(); break; } return oper; }}

2.7 策略模式解析減少算法類之間的DPE

反射

3.4 單一原則

3.5 ASD

4.開放-封閉原則 The Open-Closed

類、模塊、函數等應該可以擴展，但是不可修改ＡＳＤ

面對需求，對程序的改動是通過增加新代碼進行的，而不是更改現有代碼實現的

強內聚，松耦合

里氏代換原則　ＬＳＰ　，子類必須能夠替換父類類型

裝飾模式(Decorator) 動態地給一個對象添加一些額外的職責，就增加功能來說，裝飾模式比生成子類更加靈活。

代理模式：

class Proxy{ SchoolGirl mm; public Proxy(SchoolGirl mm){ this.mm=mm; } public void GiveDolls(){ Console.WriteLine(mm.Name+"送你洋娃娃"); } public void GiveFlowers() { Console.WriteLine(mm.Name+"送你鮮花"); } public void GiveChocolate() { Console.WriteLine(mm.Name+"送你巧克力"); }}class SchoolGirl{public string Name{ get{ return name;} set{name =value;}}private string name; }static void Main(string[] args){ SchoolGirl jiaojiao = new SchoolGirl(); jiaojiao.Name="李嬌嬌"; Pursuit daili = new Proxy(jiaojiao); daili.GiveDolls(); daili.GiveFlowers(); daili.GiveFlowers(); Console.Read();}// 代理接口interface GiveGift{ void GiveDolls(); void GiveFlowers(); void GiveChocolate();}// 追求者類class Pursuit:GiveGift{SchoolGirl mm;public Pursuit(SchoolGirl mm){ this.mm=mm;}public void GiveDolls(){ Console.WriteLine(mm.Name+"送你洋娃娃");}...}class Proxy:GiveGift{ Pursuit gg; public Proxy(SchoolGirl mm){ gg = new Pursuit(); } public void GiveDolls(){ gg.GiveDolls(); } ...}// 客戶端如下static void Main(string [] args){ SchoolGirl jiaojiao = new SchoolGirl(); jiaojiao.Name="李嬌嬌"; Proxy daili = new Proxy(jiaojiao); daili.GiveDolls(); ... Console.Read();}工廠方法模式：// 構建工廠的接口interface IFactory{ Operation CreateOperation();}class AddFactory:IFactory{ //加法類 public Operation CreateOperation(){ return new OperationAdd(); } ...}// 客戶端IFactory operFactory = new AddFactory();Operation oper = operFactory.CreateOperation();oper.NumberA=1;oper.NumberA=1;double result = oper.GetResult();

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