The template method is the most important and concise design pattern, and it is widely used.
motivation
intention
structure
code
framework developer
//框架开发者-先开发
abstract class Vehical
{
protected abstract void StartUp();
protected abstract void Run();
protected abstract void Turn(int degree);
protected abstract void Stop();
public void Test()
{
//测试数据记录
StartUp();//晚绑定————留给应用程序开发人员，扩展点
//测试数据记录
Run();//晚绑定————留给应用程序开发人员，扩展点
//测试数据记录
Stop();//晚绑定————留给应用程序开发人员，扩展点
//测试数据记录
//生成测试数据
}
}
class VehicalTestFramework
{
public static void DoTest(Vehical vehical)
{
vehical.Test();
}
}
application developer
//应用程序开发人员-晚开发
class HongQiCar:Vehical
{
protected override void StartUp()
{
}
protected override void Run()
{
}
protected override void Turn(int degree)
{
}
protected override void Stop()
{
}
}
class App
{
public void Use()
{
VehicalTestFramework.DoTest(new HongQiCar());
}
}
Point
virtual method - extension point, set to Protected
Abstract method: no concrete implementation
Virtual method: has default implementation
Creational mode: creating object types and concrete implementations (interfaces are stable)
Structural mode: interface changes