JFrame.java 文件源码

/**
 * Processes window events occurring on this component.
 * Hides the window or disposes of it, as specified by the setting
 * of the <code>defaultCloseOperation</code> property.
 *
 * @param  e  the window event
 * @see    #setDefaultCloseOperation
 * @see    java.awt.Window#processWindowEvent
 */
protected void processWindowEvent(final WindowEvent e) {
    super.processWindowEvent(e);

    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
        switch (defaultCloseOperation) {
            case HIDE_ON_CLOSE:
                setVisible(false);
                break;
            case DISPOSE_ON_CLOSE:
                dispose();
                break;
            case EXIT_ON_CLOSE:
                // This needs to match the checkExit call in
                // setDefaultCloseOperation
                System.exit(0);
                break;
            case DO_NOTHING_ON_CLOSE:
            default:
        }
    }
}