How to check the status of a caps lock key..?

You can do it without using key event, by creating an artificial key event using java.awt.Robot class to generate a "simple caracter" key press (for instance KeyEvent.VK_A).
Sample Source Code -- May not be accurate but the concept is as follows.

import java.awt.*;
import java.awt.event.*;

public class Test {

      public static void main(String[] args) throws AWTException {

            // create AWT component
            Frame f = new Frame();
            // handle component's keyPressed event
            f.addKeyListener(new KeyAdapter() {      public void
keyPressed(KeyEvent ev) {System.out.println

      (Character.isUpperCase( ev.getKeyChar()) ?       "Caps Lock
ON" :"Caps Lock OFF");}
            });
            // make component visible (otherwise the Robot won't
work)
            f.show();
            // create Robot
            Robot robot = new Robot();
            // generate simple caracter key press
            robot.keyPress(KeyEvent.VK_A);

      }

}

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Jun 3rd, 2005
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Answer

Showing Answers 1 - 9 of 9 Answers

g4java
Profile Answers by g4java

Aug 20th, 2007
Try this :
Toolkit.getDefaultToolkit().getLockingKeyState(KeyEvent.VK_CAPS_LOCK);

Tim Rousselet
Profile Answers by Tim Rousselet

May 23rd, 2011

You probably need to add !ev.isShiftDown() here if(Character.isUpperCase( ev.getKeyChar())) to check if CapsLock is really on.

hobocat

Dec 20th, 2017

There is same bug: when I changed the capslock's status，the check result change nothing.

Code
public static void main(String[] args) throws InterruptedException {  


        while(true) {


                Thread.sleep(1000);


                System.out.println(Toolkit.getDefaultToolkit().getLockingKeyState(KeyEvent.VK_CAPS_LOCK));


        }


    }