This might sound dump, but can I do such thing:

public class CameraConnection
{
    Object camera;
    public CameraConnection(bool isNewCamera)
    {
        if(isNewCamera)
        {
            camera = new Camera1();
            
        }
        else
        {
            camera = new Camera2();
        }
    }
    public void TakeImage()
    {
        camera.TakeImage();
    }
}

So here I can call camera.TakeImage() for taking an image, but base on which class the variable camera is instantiated (Camera1 or Camera2) it actually uses differrent camera APIs..

I feel like this is somewhat related to class abstraction or interface but not really sure...

Thanks a lot!

CodePudding user response：

define an interface the defines the behavior of a camera.

public interface ICamera{
  void TakePhoto();
  int HowManyPicsInCamera();
  .....
  // all the things a camera object needs to do
}

now have some classses that implement it

public class Camera1:ICamera{
    void TakeShot(){
    }
     int HowManyPicsInCamera(){
    }
}


public class Camera2:ICamera{
    void TakeShot(){
    }
     int HowManyPicsInCamera(){
    }
}

now use that

public class CameraConnection
{
    ICamera camera;
    public CameraConnection(bool isNewCamera)
    {
        if(isNewCamera)
        {
            camera = new Camera1();
            
        }
        else
        {
            camera = new Camera2();
        }
    }
    public void TakeImage()
    {
        camera.TakeImage();
    }
}

alternatively you can use a base class, you do that if there is common implementation details. Like common data or code.

CodePudding user response：

It is related to class abstraction, inheritance to be exact.

For example:

public class BaseCamera {}

public class Camera1 : BaseCamera {}

public class Camera2 : BaseCamera {}

This will then allow you to instantiate multiple camera types based on the parent class. I recommend nuking object as the type because the compiler won't be able to resolve camera.TakeImage() for example.