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How to read the status of Scroll Lock key?

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

package com.javacoderanch.example.awt;

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

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

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

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

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