src/main/java/shape/AbstractShape.java

+package shape;
+
+import javafx.scene.canvas.GraphicsContext;
+import java.awt.geom.Point2D;
+import java.util.List;
+
+public abstract class AbstractShape implements Shape{
+    private List<Point2D> points ;
+
+
+
+
+    public void addPoints(Point2D... pointsToAdd) {
+        for (Point2D point : pointsToAdd) {
+            points.add(point);
+        }
+    }
+
+
+    public  int pointsCount(){return points.size();}
+
+
+    public Point2D point(int index){
+        Point2D result = null;
+        for(int i =0;i<points.size();i++){
+            if (i == index) {
+                result = points.get(i);
+                break;
+            }
+        }
+        return result;
+    }
+
+
+
+    public abstract void draw(GraphicsContext graphicsContext);
+
+}

src/main/java/shape/ShapeContainer.java

@@ -9,7 +9,9 @@ public class ShapeContainer{
 
     private List<Shape> shapes = new ArrayList<>();
 
-    public void addShape(Shape shape){}
+    public void addShape(Shape shape){
+        shapes.add(shape);
+    }
 
     public void  draw(GraphicsContext context){
         for(Shape shape : shapes)

src/main/java/state/shape.java

+package state;
+
+import javafx.scene.canvas.GraphicsContext;
+
+import java.awt.geom.Point2D;
+import java.util.List;
+
+public abstract class shape implements shape{
+    private List<Point2D> points ;
+
+    abstract public  List<Point2D> addPoints(Point2D point);
+    public  int pointsCount(){return points.size();}
+    public Point2D point(int index){
+        for(int i =0;i.points.length;i++){
+            System.out.println(points[i]);
+            points[i]=index;
+        }
+        return index;
+    }
+    public void  draw(GraphicsContext context){
+        for(Shape shape : shapes)
+            shape.draw(context);
+    }
+
+}