Çözüldü C++ ana sınıftan türetilen sınıfın elemanlarına erişilebilir mi?

public static void main(String[] args)
{
  Shape3D my3DShape = new Shape3D(10, 20, 30);
  Shape shapeHolder = my3DShape;
  double area = shapeHolder.getArea();
  // Veya
  double area2 = ((Shape) my3DShape).getArea();
  // Veya
  Shape shape = new Shape3D(5, 10, 15);
  double area3 = shape.getArea();
}


public class Shape3D extends Shape
{

  private double width, height, depth;

  public Shape3D(double width, double height, double depth)
  {
    super("3D SHAPE");
    this.width = width;
    this.height = height;
    this.depth = depth;
  }

  public double getWidth()
  {
    return width;
  }

  public double getHeight()
  {
    return height;
  }

  public double getDepth()
  {
    return depth;
  }

  @Override
  public double getArea()
  {
    return this.width * this.height * this.depth;
  }
}

public abstract class Shape
{

  protected String name;

  public Shape(String name)
  {
    this.name = name;
  }

  public String getName()
  {
    return name;
  }

  public abstract double getArea();
}