退出前如何保存应用程序选项？ [英] How to save application options before exit?

问题描述

我已经创建了一个应用程序，我需要在退出之前保存一些选项。（类似于窗口维度，......，将写入文件中。）

I have made an application and i need to save some options before exit.(something like window dimension, ..., that will be written in a file.)

主框架设置了这个：

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

如何保存我感兴趣的选项？（在退出之前）

How can I save options that interests me?(before exiting of course)

谢谢！

推荐答案

如果您只想在应用程序关闭时执行某些操作，您可以使用以下代码挂钩关闭：

If you just want to do something when the application is shutting down, you can hook the shutdown using this code:

    Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {

        public void run() {
            // Do what you want when the application is stopping
        }
    }));

但是，这不允许您关闭窗口。如果你需要在真正退出之前检查一下，你可以覆盖 windowClosing 事件：

However, this will not allow you to not close your window. If you need to check something before really exiting, you can override the windowClosing event:

addWindowListener(new WindowAdapter() {
    public void windowClosing(WindowEvent e) {
        // Do what you want when the window is closing.
    }
});

请注意，第一个解决方案 - 使用关闭钩子 - 的优点是它与a无关窗口事件，即使应用程序被另一个事件停止也将被执行（当然，如果Java进程被残忍地杀死）。

Note that the first solution - using the shutdown hook - has the advantage that it is not related to a window event, and will be executed even if the application is stopped by another event (except, of course, if the Java process is killed brutally).

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