This example show you how to detect if the Num Lock key is in active mode.

package org.kodejava.example.awt;

import java.awt.Toolkit;
import java.awt.event.KeyEvent;

public class NumLockState {
    public static void main(String[] args) {
        Toolkit toolkit = Toolkit.getDefaultToolkit();

        // Get the locking state of the Num Lock button. If it is "on"
        // this method return boolean true value.
        boolean isOn = toolkit.getLockingKeyState(KeyEvent.VK_NUM_LOCK);

        System.out.println("NumLock button is " + (isOn ? "on" : "off"));
    }
}

If you run the program you will get an output telling you that the num lock button is active or not active.

• Author
• Recent Posts

Wayan Saryada

Founder at Kode Java Org

I am a programmer, a runner, a recreational diver, currently live in the island of Bali, Indonesia. Mostly programming in Java, Spring Framework, Hibernate / JPA. If these posts help, you can support me, buy me a cup of coffee or tea. Thank you 🥳

Latest posts by Wayan Saryada (see all)

• How do I convert java.util.TimeZone to java.time.ZoneId? - April 25, 2020
• How do I get a list of all TimeZones Ids using Java 8? - April 25, 2020
• How do I get HTTP headers using HttpClient HEAD request? - April 22, 2020