Inheritence and toString

public class Point {
	
	protected double x;
	protected double y;
	
	public Point() 
	{
		
	}
	
	public Point(double x, double y)
	{
		this.x = x;
		this.y = y;
	}
	
	public Point(Point point)
	{
		x = point.x;
		y = point.y;
	}
	
	public Point add(Point z)
	{
		return new Point(x + z.x, y + z.y);
	}
	
	@Override
	public String toString()
	{
		return "Point: (" + x + "," + y + ")";
	}
}

public abstract class Shape {
	protected Point position;
	
	public void move(double x, double y){ 
		position.x = x;
		position.y = y;
	}
	
	public abstract void show();
}

public class Line extends Shape{
	
	Line(Point start, Point end)
	{
		position = new Point(start);
		this.end = new Point(end.x - start.x, end.y - start.y);
	}
	
	@Override
	public String toString()
	{
		return "Line: " + position + " to " + position.add(end);
	}
	
	public void show()
	{
		System.out.println("\n" + toString());
	}
	
	private Point end;
}

public class ShapesMain {

	public static void main(String[] args) {
		Shape shapes[] = new Shape[10];
		Point pts = null;
		Point p1 = null;
		Point p2 = null;
		double minRadius = 20.0;
		double maxRadius = 20.0;
		double maxDist = 100.0;
		int minPts = 2;
		int maxPts = 15;
		int choice = 0;
		
		for(int i = 0; i < 10; i++)
		{
			choice = (int) (Math.random() * 3);
			switch(choice)
			{
			case 0:
				p1 = new Point((int) (Math.random()*maxDist), (int) (Math.random()*maxDist));
				p2 = new Point((int) (Math.random()*maxDist), (int) (Math.random()*maxDist));
				shapes[i] = new Line(p1, p2);
				break;
			case 1:
				p1 = new Point((int) (Math.random()*maxDist), (int) (Math.random()*maxDist));
				shapes[i] = new Circle(p1, (int) (minRadius + (maxRadius - minRadius) * Math.random()));
				break;
			case 2:
				p1 = new Point((int) (Math.random() * maxDist), (int) (Math.random() * maxDist));
				p2 = new Point((int) (Math.random() * maxDist), (int) (Math.random() * maxDist));
				shapes[i] = new Rectangle(p1, p2);
				break;
			default:                                                      
		          System.out.println("\nInvalid shape choice = " + choice);
		          System.exit(1);
		          break;
			}
		}
		
		for(Shape shape : shapes)
		{
			shape.show();
		}
	}

}

public void show()
    {
        System.out.println("\n" + toString());
    }

@Override
	public String toString()
	{
		return "Line: " + position + " to " + position.add(end);
	}