//Shape.java

public abstract class Shape
{
    protected Point position;

    abstract double computeArea();

    public Point getPosition()
    {
        return this.position;
    }

    public void setPosition(Point position)
    {
        this.position = position;
    }

    public void movePositionRelative(Point position)
    {
        double x = this.position.getX() + position.getX();
        double y = this.position.getY() + position.getY();

        this.position.setX(x);
        this.position.setY(y);
    }
}