专业做汽车的网站,北京微网站建设,如何在百度上投放广告,卓手机建网站Unity实现设计模式——模板方法模式
模板模式(Template Pattern)#xff0c; 指在一个抽象类公开定义了执行它的方法的模板。它的子类可以按需要重写方法实现#xff0c;但调用将以抽象类中定义的方式进行。 简单说#xff0c; 模板方法模式定义一个操作中的算法的骨架 指在一个抽象类公开定义了执行它的方法的模板。它的子类可以按需要重写方法实现但调用将以抽象类中定义的方式进行。 简单说 模板方法模式定义一个操作中的算法的骨架而将这些步骤延迟到子类中使得子类可以不改变一个算法的结构就可以重定义该算法的某些特定步骤。 注意模板方法模式和策略模式的区别 模板模式注意强调了抽象类公开定义了一个执行的模板方法而策略模式是对单个算法的封装更具有独立性
下面使用两个例子去介绍模板方法模式
1.第一个例子使用比较抽象的例子
一AbstractClass
abstract class AbstractClass
{public abstract void PrimitiveOperation1();public abstract void PrimitiveOperation2();// The Template methodpublic void TemplateMethod(){PrimitiveOperation1();PrimitiveOperation2();Debug.Log();}
}二ConcreteClassA
class ConcreteClassA : AbstractClass
{public override void PrimitiveOperation1(){Debug.Log(ConcreteClassA.PrimitiveOperation1());}public override void PrimitiveOperation2(){Debug.Log(ConcreteClassA.PrimitiveOperation2());}
}三ConcreteClassB
class ConcreteClassB : AbstractClass
{public override void PrimitiveOperation1(){Debug.Log(ConcreteClassB.PrimitiveOperation1());}public override void PrimitiveOperation2(){Debug.Log(ConcreteClassB.PrimitiveOperation2());}
}四测试
public class TemplateMethodStructure : MonoBehaviour
{void Start ( ){AbstractClass aA new ConcreteClassA();aA.TemplateMethod();AbstractClass aB new ConcreteClassB();aB.TemplateMethod();}
}2.第二个例子使用一个三明治的制作过程来介绍
一Hoagie 三明治抽象基类 public abstract class Hoagie{public void MakeSandwich(){Debug.Log(Making new Sandwich);CutBun();if (CustomerWantsMeat()){AddMeat();}if (CustomerWantsCheese()){AddCheese();}if (CustomerWantsVegetables()){AddVegetables();}if (CustomerWantsCondiments()){AddCondiments();}WrapTheHoagie();}protected abstract void AddMeat();protected abstract void AddCheese();protected abstract void AddVegetables();protected abstract void AddCondiments();protected virtual bool CustomerWantsMeat() { return true; } // called Hookprotected virtual bool CustomerWantsCheese() { return true; }protected virtual bool CustomerWantsVegetables() { return true; }protected virtual bool CustomerWantsCondiments() { return true; }protected void CutBun(){Debug.Log(Bun is Cut);}protected void WrapTheHoagie(){Debug.Log(Hoagie is wrapped.);}}二ItalienHoagie 法式三明治 public class ItalienHoagie : Hoagie{protected override void AddMeat(){Debug.Log(Adding the Meat: Salami);}protected override void AddCheese(){Debug.Log(Adding the Cheese: Provolone);}protected override void AddVegetables(){Debug.Log(Adding the Vegetables: Tomatoes);}protected override void AddCondiments(){Debug.Log(Adding the Condiments: Vinegar);}}三VeggieHoagie 素菜三明治 public class VeggieHoagie : Hoagie{protected override void AddMeat(){}protected override void AddCheese(){}protected override void AddVegetables(){Debug.Log(Adding the Vegetables: Tomatoes);}protected override void AddCondiments(){Debug.Log(Adding the Condiments: Vinegar);}protected override bool CustomerWantsMeat() { return false; }protected override bool CustomerWantsCheese() { return false; }}四错误的方式
namespace BadExample{// this way you would have to rewrite a lot of code// especially if something changes or another class differs and does e.g. not AddMeat()public class ItalienHoagie{public void MakeSandwich(){CutBun();AddMeat();AddCheese();AddVegtables();AddCondiments();WrapHoagie();}public void CutBun(){Debug.Log(Hoagie is Cut);}public void AddMeat(){Debug.Log(Added Meat);}public void AddCheese(){Debug.Log(Added Cheese);}public void AddVegtables(){Debug.Log(Added Vegies);}public void AddCondiments(){Debug.Log(Added Condiments);}public void WrapHoagie(){Debug.Log(Wrapped Hoagie);}}}五测试 public class TemplateMethodPatternExample1 : MonoBehaviour{void Start(){Hoagie cust12Hoagie new ItalienHoagie();cust12Hoagie.MakeSandwich();Hoagie cust13Hoagie new VeggieHoagie();cust13Hoagie.MakeSandwich();}}
