Java从另一个类处理JFrame窗口

Question

A class Main has main method in which JFrame is constructed. And class MainView has panels and buttons which are appended on the JFrame.

What I need to do is disposing JFrame window by clicking a certain button.

I have tried various ways which I have found from here, Stackoverflow. But no solution so far.

public final class Main {

static JFrame frame = null;

public static void main(String[] args) throws IOException {

    SwingUtilities.invokeLater(new Runnable() {
        @Override
        public void run() {

            try {
                frame = new MainView("Blackjack 2017");
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setSize(650, 450);
            frame.setVisible(true);
        }
    });


}
}

From

public class MainView extends JFrame implements ActionListener {

private static final long serialVersionUID = 4728244239185625080L;
private Dealer dealer;
private User user;
private ControlPanel controlPanel;
public static Container c;

public MainView() {

}

public MainView(String title) throws IOException {

    super(title);

    dealer = new Dealer();
    user = new User();

    System.out.println(title + " frame made");

    controlPanel = new ControlPanel();
    controlPanel.setControlPanel();

    c = getContentPane();
    c.add(controlPanel);

    controlPanel.getPlayBtn().addActionListener(this);
    controlPanel.getExitBtn().addActionListener(this);
}

@Override
public void actionPerformed(ActionEvent e) {
    if (e.getActionCommand().equals("Play")) {
        System.out.println("play clicked");
        c.removeAll();
        c.add(playPanel);
        c.validate();

    } else if (e.getActionCommand().equals("Exit")) {


    }

Answer 1

Check out Closing an Application for some basics about closing a frame (or dialog).

You can just use The ExitAction class, which is a generic Action that can be added to any button (or menu item) and will act as if the user clicked on the close button of the window.

The code works by dispatching a windowClosing event to the window. So it assumes you have invoked the setDefaultCloseOperation(...) for the window.