AbstractShape.java

package shape;

import javafx.geometry.Point2D;

import java.util.ArrayList;
import java.util.List;

public abstract  class AbstractShape implements Shape {
    private List<Point2D> points = new ArrayList<>();

    public void addPoints(Point2D... points){//Point2D... refere a plusieurs points
         for(Point2D point:points) {
             this.points.add(point); //this.points refere a la liste
         }
    }

}