Help - Using JSlider to zoom on a grid

I have no idea how I'd go about doing this. Can anyone provide some insight?

 

Add your own implementation of the ChangeListener interface to your JSlider. In the overridden stateChanged() method, get the current value of the JSlider and use that to zoom.

In pseudo-code

Code:

final JSlider jSlider = ...; //Whatever your JSlider is; it's marked final so it can be accessed by the anonymous inner class declared below
jSlider.addChangeListener(new ChangeListener()
{
    @Override
    public void stateChanged(ChangeEvent e)
    {
        int zoomValue = jSlider.getValue();
        zoom(zoomValue); //Do whatever you need to do to zoom to the given value; idk what you're using specifically as your grid so I can't go into much more detail on this
    }
});

 

I've already done all the listeners. I don't know how I'd physically zoom into a GridLayout though.