New to Java

I'd be really grateful if someone could point me to the right place to find an answer...

I'm working on my first java mini application which cycles a set of traffic lights.
I want to stop the timed sequence with a key press to simulate the operator switching the system off, then carry out a graceful stop.

There is no applet or other (eg JFrame) GUI - just System.out.printlns to show the "lights" etc

I think I should be able to stop the sequence by listening for "x" for example - as a keyTyped (KeyEvent ke) but I cannot addKeyListener to my control object. All the examples in the books and in the documentation use GUIs.

I have overridden methods for keyPressed and keyReleased - it's just what to addKeyListener to that I am struggling with...

Here's my main method (which isn't right!)

public static void main (String[] args) {
    	SystemControl lightsAtElgin = new SystemControl();
    	//lightsAtElgin.addKeyListener(this); // this ain't right!
    	lightsAtElgin.systemStartUp(true);
    	lightsAtElgin.runSequence();
    	lightsAtElgin.systemStartUp(false); // never gets here...
    }

and here's the first (relevant bit of the class)...

public class SystemControl implements KeyListener { 

    private TrafficLightUnit unitOne = new TrafficLightUnit ("Unit One");
    private TrafficLightUnit unitTwo = new TrafficLightUnit ("Unit Two");
    private String systemSwitch; // operator switch
    private boolean notStopped;
    Scanner sc = new Scanner(System.in);
    
    // initialise with system switched off
    public SystemControl () {
    	systemSwitch = "OFF";
    	notStopped = false;
    }
    
    // key event interface methods...
    public void keyPressed(KeyEvent ke) {
    }
    
    public void keyReleased(KeyEvent ke) {
    }
    
    public void keyTyped(KeyEvent ke) {
    	char id = ke.getKeyChar();
    	String x = "x";
    	
    	if (x.equals(id)) {
    		notStopped = false;
    	} 
    	
    }

the timed sequence would break out like this...

while (notStopped) {
    // do sequence
}