来看一下经常用来被举例的汽车对象。
首先定义Abstraction。
public abstract class Car
{
public IEngine _engine;
public Car(IEngine engine)
{
_engine = engine;
}
public virtual void Start()
{
_engine.Start();
}
public virtual void Stop()
{
_engine.Stop();
}
}
接着实现不同的汽车类型。
public class Bus : Car
{
public Bus(IEngine engine)
: base(engine)
{
}
public override void Start()
{
base.Start();
Console.WriteLine("Bus Start");
}
public override void Stop()
{
base.Stop();
Console.WriteLine("Bus Stop");
}
}
public class Limousine : Car
{
public Limousine(IEngine engine)
: base(engine)
{
}
public override void Start()
{
base.Start();
Console.WriteLine("Limousine Start");
}
public override void Stop()
{
base.Stop();
Console.WriteLine("Limousine Stop");
}
}
再定义第二个变化维度，即发动机的接口。
public interface IEngine
{
void Start();
void Stop();
}
最后实现不同的发动机。
public class GasEngine : IEngine
{
public void Start()
{
Console.WriteLine("Gas Engine Start");
}
public void Stop()
{
Console.WriteLine("Gas Engine Stop");
}
}
public class DieselEngine : IEngine
{
public void Start()
{
Console.WriteLine("Diesel Engine Start");
}
public void Stop()
{
Console.WriteLine("Diesel Engine Stop");
}
}
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