How to check JToggleButton state in a class from another class using IF-statement that have actionPerformed within it?

I am learning java for a month now and already had simple project for learning but now I have problems with JToggleButton, ItemEvent, and actionPerformed included in If-statement.

I've searching for a week for examples on using actionPerformed within if-statement that have ItemEvent from another class but i can't find a same problem to produce a working result.

I'm trying to make a window scanner that will scan only if toggle button is selected then paint JPanel using buffered image (repaint every 100 millisecond) and disposed it if toggle button is deselected, but I think my approach to do it is wrong. I have one main class and two sub-classes like these:

Main class:

public class WindowScanner {
    public static void main(String[] args) {
        new Window().setVisible(true);
    }
}

Window class:

class Window extends JFrame {
    static JToggleButton captureButton = new JToggleButton("CAPTURE");

    @SuppressWarnings("Convert2Lambda")
    public Window() {
        // JFrame looks codes

        add(captureButton);
        // capture button default looks code
        ItemListener captureListener = new ItemListener(){
            @Override
            public void itemStateChanged(ItemEvent captureButtonEvent) {
                int captureState = captureButtonEvent.getStateChange();
                if(captureState == ItemEvent.SELECTED){
                    // capture button SELECTED looks code
                    System.out.println("capture button is selected");
                } else if(captureState == ItemEvent.DESELECTED){
                    // capture button DESELECTED looks code
                    System.out.println("capture button is deselected");
                }
            }
        }; captureButton.addItemListener(captureListener);
    }
}

Scanner class:

public class Scanner extends Window {

    private static BufferedImage imageCaptured;
    static int delay = 100;

    protected BufferedImage imageScanned(){
        return imageCaptured;
    }

    @SuppressWarnings("Convert2Lambda")
    public static void Scan() {
        if (captureButton.isSelected()) {
            ActionListener taskPerformer = new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent captureEvent) {
                    try {
                        // capturing method
                    } catch (AWTException error) {
                        // AWTException error method
                    }
                    // is this the right place to put JPanel code?
                    JPanel panel = new JPanel();
                    imageCaptured = new BufferedImage(500, 500, BufferedImage.TYPE_INT_ARGB);
                    Graphics2D graphic = imageCaptured.createGraphics();
                    panel.setSize(500,500);
                    panel.paint(graphic);
                    panel.revalidate();
                    panel.repaint();
                }
            }; new Timer(delay, taskPerformer).start();
        } else {
            // this suppose to end capturing if capture button isSelected() == false
        }
    }
}

So here is my questions:

1. Do I really have to make Main class separated from Window class? What the reason?
2. How to make my if statement in Scan method recognize state of my JToggleButton from Window class? Is it impossible and I had a wrong approach to do it?
3. In Scanner class, i can't make a get/set for my actionPerformed (Netbeans always checked it as an error), but why I can make one for BufferdImage?
4. If I can't get question number 3 happen, how can I make If statement to stop capturing using Timer.stop()? Or am I in wrong approach again?
5. Do my JPanel in Scanner class would be produced and make a viewer for my buffered image?

P.S. I'm sorry it cramped with questions, I tried not to make multiple post, so I make single post with multiple questions. Please notice me if there's answer before, I'm honestly can't find it or had search it with wrong tags.