ImageJ actionmap

Question

I'm new to programming in Java, but I managed to learn the basics at this moment. At this moment I try to do image analysis with the program ImageJ.

In this code I've got an picture (which is refered as an ImagePlus object). In this script the first part consist of some processing. Afterwards I would like to select some specific spots by hand. After this selection I would like to run another processing script.

To do this I managed to get the first processing part. Then I would like to have a code which results in a pause of the script. When I press a button (like spacebar) I would like to continue the script and do the last part of the processing.

At this moment this is my draft;

class Help{

import static java.awt.event.KeyEvent.VK_E;

public class Help extends JComponent{
    private final static int onmask_one = InputEvent.ALT_GRAPH_DOWN_MASK;

    public static void main(String[] args) {
        //some post processing
        ImagePlus imp = IJ.getImage();//makes a object of the Image
        Help a = new Help();
        a.keyBindingExample();

    }

    void keyBindingExample() {
        Action spacebarAction= new AbstractAction() {
            public void actionPerformed(ActionEvent e) {
                // do something when spacebar button pressed;
            }
        };

        InputMap inputMap = ?.InputMap(JPanel.WHEN_FOCUSED);
        ActionMap actionMap = ?.ActionMap();

        inputMap.put(KeyStroke.getKeyStroke("SPACEBAR"), "spacebarAction");
        actionMap.put("spacebarAction", spacebAraction);
}

On the internet I could find this draft, but I don't really get what kind of instance I could use in Inputmap inputMap = ?.Inputmap(JPanel.WHEN_IN_FOCUSED_WINDOW);

Is this a Jcomponent? Does this mean that I have to make a Jcomponent of my ImagePlus object?

I know there is also some issues about the focus of the right window. I'm not sure what the settings are in this concept. I would like to continue the script without having a specific window focused. __solved; I should have to use JPanel.WHEN_FOCUSED to have a focus on the keyboard without any problems on window focus.

Hope you can help me out.

EDIT: I edited some of the code to clarify things. which weren't so clear in the original post.