Question

CircleListener is an inner class in my panel class and it involves MouseListener interface now. MouseRelased method checks if the clicked area is encircled by a circle and if so it sets that shape to selected and removes the selected ones.

Now I need to an ActionListener to add random sized circles to this panel with a “timer” object.
Question: Is it possible to implement “ActionListener” to CircleListener or it is better to create another inner class for “ActionListener”?

Thanks in advance

private class CircleListener implements MouseListener
{
    ShapesCanvas canvas;
    ShapeContainer container;
    Shape possibleShape;

    private CircleListener(ShapesCanvas canv, ShapeContainer cont)
    {
        this.canvas = canv;
        this.container = cont;
    }

    public void MouseRelased (MouseEvent e)
    {
        possibleShape = container.contains( e.getX(), e.getY());

        if( possibleShape != null)
        {
            ( (Selectable)possibleShape).setSelected(true);
            container.removeSelected();
        }
        canvas.repaint(); //repaints the last situation
    }

Answer 1

It is definetly possible, just declare

private class CircleListener implements MouseListener, ActionListener

You can create two classes instead, and that is actually what I prefer, because then you have two distinct entities with clearly defined purposes. Each entity is responsible for just one function.

But both approaches are valid.