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How to read the status of Num Lock key?

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

package com.javacoderanch.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.