public class UI(){

    public static int cursorvar = 0;

    public UI(){
        JFrame frame = new JFrame();
        //frame settings and so on
        frame.setCursor(cursorvar);
    }
}

public class SettingsWindow(){

    public SettingsWindow(){

        //Window and window parameters

       button.addActionListener(new ActionListener(){

           public ActionListener(){
               cursorvar++;
               System.out.println(cursorvar);
           }
       }
 }
 }