Работа с пакетами

package TryGeometry;
public class Point
{
    
    public Point (double xVal, double yVal)
    {
        x = xVal;
        y = yVal;
    }
    public Point (final Point oldPoint)
    {
        x = oldPoint.x;
        y = oldPoint.y;
    }
    public void move (double xDelta, double yDelta)
    {
        x += xDelta;
        y += yDelta;
    }
    public double distance (final Point aPoint)
    {
        return Math.sqrt( Math.pow((double) (x - aPoint.x), 2.0) + Math.pow((double)(y - aPoint.y), 2.0) );
    }
    public String toString()
    {
        return Double.toString(x) + ", " + y;
    }
    public double getX()
    {
        return x;
    }
    public double getY()
    {
        return y;
    }
    public void setX(double inputX)
    {
        x=inputX;
    }
    public void setY(double inputY)
    {
        y=inputY;
    }
    private double x;
    private double y;
}

package TryGeometry;
public class Line
{
    Point start;
    Point end;
    public Line(final Point start, final Point end)
    {
        this.start = new Point(start);
        this.end = new Point(end);
    }
    public Line(double xStart, double yStart, double xEnd, double yEnd)
    {
        start = new Point (xStart, yStart);
        end = new Point (xEnd, yEnd);
    }
    public double length()
    {
        return start.distance(end);
    }
    public String toString()
    {
        return "(" + start + ") : (" + end + ")";
    }
    public Point intersects(final Line line1)
    {
        Point localPoint = new Point(0, 0);
        double num =
            (this.end.getY() - this.start.getY()) * (this.start.getX() - line1.start.getX()) - 
            (this.end.getX() - this.start.getX()) * (this.start.getY() - line1.start.getY());
        double denom =
            (this.end.getY() - this.start.getY()) * (line1.end.getX() - line1.start.getX()) - 
            (this.end.getX() - this.start.getX()) * (line1.end.getY() - line1.start.getY());
        localPoint.setX(line1.start.getX() + (line1.end.getX() - line1.start.getX()) * num/denom);
        localPoint.setY(line1.start.getY() + (line1.end.getY() - line1.start.getY()) * num/denom);
        return localPoint;
    }
}

package TryGeometry;
public class TryPackage
{ 
    public static void   main(String[] args)
    {
        double [][] coords = {{1.0,0.0},{6.0,0.0},{6.0,10.0},
                              {10.0,10.0},{10.0,-14,0},{8.0,-14,0}};
        Point [] points = new Point[coords.length];
        for (int i=0;i<coords.length;i++)
            points[i] = new Point(coords[i][0],coords[i][1]);
            Line[] lines = new Line[points.length-1];
            double totalLength=0.0;
            for(int i=0;i<points.length-1;i++)
            {
                lines[i] = new Line(points[i],points[i+1]);
                totalLength+=lines[i].length();
                System.out.println("Line "+(i+1)+' '+lines[i]
                    +"Length is "+lines[i].length());
            } 
            System.out.println("\nTotal line length= "+totalLength);
    }
}

import TryGeometry.Point;
import TryGeometry.Line;