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Editorial Team
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Asked: 2026-05-15T08:55:07+00:00

Is there a method to turn on/off Caps Lock, Scroll Lock and Num Lock

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Is there a method to turn on/off Caps Lock, Scroll Lock and Num Lock on Windows?

Please post the code snippet in any language… but my preference is C/C++ or Java.

P.S. I’m making a Morse Code program which blinks the Scroll Lock LED.

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1 Answer

  1. Editorial Team

    The Java code is…

    Get the Toolkit object…

    Toolkit toolkit = Toolkit.getDefaultToolkit();

    To turn on Caps Lock, Scroll Lock, Num Lock…

    toolkit.setLockingKeyState(KeyEvent.VK_CAPS_LOCK, true);
toolkit.setLockingKeyState(KeyEvent.VK_SCROLL_LOCK, true);
toolkit.setLockingKeyState(KeyEvent.VK_NUM_LOCK, true);

    To turn off Caps Lock, Scroll Lock, Num Lock…

    toolkit.setLockingKeyState(KeyEvent.VK_CAPS_LOCK, false);
toolkit.setLockingKeyState(KeyEvent.VK_SCROLL_LOCK, false);
toolkit.setLockingKeyState(KeyEvent.VK_NUM_LOCK, false);
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