Clock.java

package checkers;
import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;

/**
 * Component showing game clock
 */
public class Clock extends JPanel
{
	
	private static final long serialVersionUID = 8988209987063047869L;
	private final JLabel label;
	private final Timer timer;
	private int time=0;
	
	public Clock()
	{
		
		label = new JLabel();
		add(label);
		label.setFont(new Font(Font.MONOSPACED, Font.BOLD, 16));
		timer = new Timer(1000, new ActionListener()
		{
			@Override
			public void actionPerformed(ActionEvent e)
			{
				time++;
				update();
			}
		});
		
		update();
		
	}
	
	private void update()
	{
		label.setText(String.format("%02d:%02d", time/60,time%60));
	
		if(timer.isRunning())
			label.setForeground(Color.RED);
		else
			label.setForeground(Color.BLACK);
		
	}
	
	public void stop()
	{
		timer.stop();
		update();
	}
	
	public void reset()
	{
		time=0;
		update();
		stop();
	}
	
	public void start()
	{
		timer.start();
		update();
	}
	
	@Override
	protected void finalize() throws Throwable
	{
		timer.stop();
	}
	
}