Помогите по Java

 interface AreaCalculable { 
    double calculateArea(); 
} 
 
abstract class Graph { 
    abstract void draw(); 
    abstract void moveTo(int x, int y); 
    abstract void move(int deltaX, int deltaY); 
} 
 
class Point extends Graph { 
    private int x, y; 
     
    Point(int x, int y) {this.x = x; this.y = y;} 
     
    @Override void draw() {System.out.println("Drawing Point at (" + x + ", " + y + ")");} 
     
    @Override void moveTo(int x, int y) {this.x = x; this.y = y;} 
     
    @Override void move(int deltaX, int deltaY) {x += deltaX; y += deltaY; System.out.println("Point moved to (" + x + ", " + y + ")");} 
} 
 
class Line extends Graph { 
    private Point start, end; 
     
    Line(Point start, Point end) {this.start = start; this.end = end;} 
     
    @Override void draw() {System.out.println("Drawing Line from (" + start.x + ", " + start.y + ") to (" + end.x + ", " + end.y + ")");} 
     
    @Override void moveTo(int x, int y) {int dX = x - start.x, dY = y - start.y; start.move(dX, dY); end.move(dX, dY);} 
     
    @Override void move(int dX, int dY) {start.move(dX, dY); end.move(dX, dY); System.out.println("Line moved to (" + start.x + ", " + start.y + ") and (" + end.x + ", " + end.y + ")");} 
} 
 
class Circle extends Graph implements AreaCalculable { 
    private Point center; 
    private double radius; 
     
    Circle(Point center, double radius) {this.center = center; this.radius = radius;} 
     
    @Override void draw() {System.out.println("Drawing Circle with center at (" + center.x + ", " + center.y + ") and radius " + radius);} 
     
    @Override void moveTo(int x, int y) {center.move(x - center.x, y - center.y);} 
     
    @Override void move(int dX, int dY) {center.move(center.x + dX, center.y + dY); System.out.println("Circle moved to center (" + center.x + ", " + center.y + ")");} 
     
    @Override public double calculateArea() {return Math.PI * radius * radius;} 
} 
 
class Rectangle extends Graph implements AreaCalculable { 
    private Point topLeft; 
    private int width, height; 
     
    Rectangle(Point topLeft, int width, int height) {this.topLeft = topLeft; this.width = width; this.height = height;} 
     
    @Override void draw() {System.out.println("Drawing Rectangle with top-left corner at (" + topLeft.x + ", " + topLeft.y + "), width " + width + ", and height " + height);} 
     
    @Override void moveTo(int x, int y) {topLeft.move(x, y);} 
     
    @Override void move(int dX, int dY) {topLeft.move(topLeft.x + dX, topLeft.y + dY); System.out.println("Rectangle moved to top-left corner (" + topLeft.x + ", " + topLeft.y + ")");} 
     
    @Override public double calculateArea() {return width * height;} 
} 
 
public class Main { 
    public static void main(String[] args) { 
        Point point = new Point(1, 2); 
        Line line = new Line(new Point(3, 4), new Point(5, 6)); 
        Circle circle = new Circle(new Point(7, 8), 9); 
        Rectangle rectangle = new Rectangle(new Point(10, 11), 12, 13); 
 
        point.draw(); 
        line.draw(); 
        circle.draw(); 
        rectangle.draw(); 
 
        System.out.println("Area of Circle: " + circle.calculateArea()); 
        System.out.println("Area of Rectangle: " + rectangle.calculateArea()); 
 
        line.moveTo(15, 16); 
        rectangle.move(3, 4); 
    } 
}