后台运行的程序（JAVA）
我想编写一个时钟程序，如果同时按下键“1”和“2”，它应该在后台运行并根据系统广播当前时间。我已经有一个程序本身（包括音频文件和附件），所以我需要的一切就是找到使程序窗口处于非活动状态的方法，但要以按下按键时它会激活的方式进行。我能做些什么？
i want to write a clock program, that should run at background and broadcast the current time according to the system if the keys "1" and "2" are pressed together. i already have a program itself (including audiofiles and appendings) so everything i need, is to find the way to make the program window inactive, but to do it in such way that it will activate when the keys are pressed. what can i do?
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在带有 KDE 的 Linux 上，您可以使用 khotkeys 设置键盘热键，该热键将向您的程序发送一条 dbus 消息，告诉它重新激活。我不知道 1 和 2 一起是否是允许的热键 - 它没有多大意义，因为它可能会导致 1 或 2 输入到您当前使用的程序中，这可能会或可能不会执行任何操作，但最好使用 ctrl、alt 或 windows 键等键来避免这个问题。
在其他环境/操作系统中可能有类似于 khotkeys 的东西，我不知道。
On Linux with KDE you can use khotkeys to set up a keyboard hotkey which will send e.g. a dbus message to your program to tell it to reactivate. I don't know if 1 and 2 together is an allowable hotkey - it doesn't make much sense because it will likely cause a 1 or 2 to be inputted into the program you are currently using, which may or may not do anything but it's better to use a key like ctrl, alt or the windows key to avoid that problem.
In other environments / operating systems there may be something similar to khotkeys, I don't know.
我不认为 Java 可以在这里帮助你 - 你正在寻找类似 TSR 的东西，不幸的是它不是 Java 的东西。无论如何，他们和 MSDOS 一起走上了恐龙的道路。
在现代操作系统上，您必须原生地处理类似的事情。
I dont think Java can help you here - you're looking at something like a TSR, which unfortunately is not a Java thing. They went the way of the dinosaurs anyway, along with MSDOS.
You've to go native for something like this on the modern operating systems.