java - 您将如何关闭jpanel？

我有以下代码：

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

    // ask player for his username, this is used for login.
    Random rand = new Random();
    int r = rand.nextInt(1000 - 1) + 1;

    Object[] options1 = {"Login", "Random Username",
            "Quit"};

    JPanel panel = new JPanel();
    panel.add(new JLabel("Enter your desired username:"));
    JTextField textField = new JTextField(16);
    panel.add(textField);

    //random usernames
    String words = "username:noob:player:slayer:foreveruser:forevernoob:foreverplayer:lol:wrectlikeaboos:darkalien:gold_in_silver:zeebra:zebra:maddox:canada:canadian:richtard";
    String[] wordsAsArray = words.split(":");
    int index = new Random().nextInt(wordsAsArray.length);
    String randomWord = wordsAsArray[index];
    Random num = new Random();
    int numr = num.nextInt(1000 - 1) + 1;

    int result = JOptionPane.showOptionDialog(null, panel, "Forever: Login",
            JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE,
            null, options1, null);
    if (result == JOptionPane.YES_OPTION) {
        JOptionPane.showMessageDialog(null, "Logged in as " + textField.getText());
    }
    //randomusername = no
    //quit = cancel
    if (result == JOptionPane.CANCEL_OPTION) {
        System.exit(1)
    }
    if (result == JOptionPane.NO_OPTION) {
        JOptionPane.showMessageDialog(null, "Logged in as " + randomWord + numr);
    }
    //String user = JOptionPane.showInputDialog("Enter your username: ", "User"+r);
    Login client = new Login("hi");
}

public Login(String userName) throws MalformedURLException {
    Launcher launcher = new Launcher();
    launcher.init();
    this.username = userName;
}

基本上，当您运行该程序时，会弹出一个对话框，询问您的用户名。如果按quit，它将以没有任何用户名的方式运行游戏（不应该发生），如果按X，它也将运行。我将如何使它仅结束程序而不是在没有任何用户名的情况下运行。

谢谢。

最佳答案

在您处理按quit的操作的地方，您可以致电System.exit(int)（假设您没有要清理或保存的内容，而shutdown hook中没有这样做）。