update

src/main/java/Snake/SnakeView.java

@@ -15,6 +15,16 @@ public class SnakeView implements Drawable{
         this.cellSize = cellSize;
     }
 
+    public void setPositions(ArrayList<Point> newPositions)
+    {
+        positions.clear();
+        for(var newPosition : newPositions)
+        {
+            Point positionInGrid = newPosition;
+            positions.add(new Point((int)positionInGrid.getX()*cellSize,
+                    (int)positionInGrid.getY()*cellSize));
+        }
+    }
 
     @Override
     public void draw(Graphics g) {