问题描述

获取顶层窗口：

public void actionPerformed(ActionEvent e) {
  JComponent comp = (JComponent) e.getSource();
  Window win = SwingUtilities.getWindowAncestor(comp);
  win.dispose();
}

确保已将JFrame的默认关闭操作设置为JFrame.DISPOSE_ON_CLOSE（首选）或JFrame.EXIT_ON_CLOSE（首选）。

如果有可能会从JMenuItem调用此方法，那么除非您首先测试组件的父级是JPopupMenu还是JToolBar，否则它将不起作用。如果是这样，那么您应该使用更健壮的解决方案，例如可以在java- swing-tips上找到，特别是以下代码：

class ExitAction extends AbstractAction {
    public ExitAction() {
        super("Exit");
    }
    @Override public void actionPerformed(ActionEvent e) {
        JComponent c = (JComponent) e.getSource();
        Window window = null;
        Container parent = c.getParent();
        if (parent instanceof JPopupMenu) {
            JPopupMenu popup = (JPopupMenu) parent;
            JComponent invoker = (JComponent) popup.getInvoker();
            window = SwingUtilities.getWindowAncestor(invoker);
        } else if (parent instanceof JToolBar) {
            JToolBar toolbar = (JToolBar) parent;
            if (((BasicToolBarUI) toolbar.getUI()).isFloating()) {
                window = SwingUtilities.getWindowAncestor(toolbar).getOwner();
            } else {
                window = SwingUtilities.getWindowAncestor(toolbar);
            }
        } else {
            Component invoker = c.getParent();
            window = SwingUtilities.getWindowAncestor(invoker);
        }
        if (window != null) {
            //window.dispose();
            window.dispatchEvent(new WindowEvent(window, WindowEvent.WINDOW_CLOSING));
        }
    }
}

来源：WindowClosingAction

解决方法

JTabbedPane tabbedPane = new JTabbedPane();
JButton btnClose = new JButton("Close");
JComponent panel.add(btnClose);
tabbedPane.addTab("Test",panel);

btnClose.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                panel.dispatchEvent(new WindowEvent(frame,WindowEvent.WINDOW_CLOSING));
            }
        });

 Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: null source