如何检查键被按下在Java启动 [英] How to check for key being held down on startup in Java

问题描述

我想写弹出当程序第一次启动时的分辨率选择对话框。以prevent无聊的用户，我要实现的相当标准的功能，您可以关闭该对话框有一个复选框，但在启动时按住alt键把它找回来。

不幸的是，要问的java没有明显的方式给定的密钥是否目前正在pressed 。您只能注册被告知通过的KeyListener新的密钥presses，但如果关键preSS应用程序启动之前就开始这样做没有帮助。

解决方案

 公共类LockingKeyDemo {
    静态工具包套件= Toolkit.getDefaultToolkit（）;    公共静态无效的主要（字串[] args）{
    的System.out.println（大写锁2 =
    + kit.getLockingKeyState（KeyEvent.VK_CAPS_LOCK））;
}
}
 

I'm trying to write a resolution selection dialog that pops up when a program first starts up. To prevent boring the user, I want to implement the fairly standard feature that you can turn off that dialog with a checkbox, but get it back by holding down the alt key at startup.

Unfortunately, there is no obvious way to ask java whether a given key is currently being pressed. You can only register to be informed of new key presses via a KeyListener, but that doesn't help if the keypress starts before the app launches.

解决方案

public class LockingKeyDemo {
    static Toolkit kit = Toolkit.getDefaultToolkit();

    public static void main(String[] args) {
    	System.out.println("caps lock2 = "
    			+ kit.getLockingKeyState(KeyEvent.VK_CAPS_LOCK));
}
}

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