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.