package horstmann.ch04_timer;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.util.Date;

import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.Timer;

/**
   This program shows a clock that is updated once per second.
 */
public class TimerTester
{
	public static void main(String[] args)
	{
		JFrame frame = new JFrame();

		final int FIELD_WIDTH = 20;
		final JTextField textField = new JTextField(FIELD_WIDTH);

		frame.setLayout(new FlowLayout());
		frame.add(textField);

		ActionListener listener = event -> {
			Date now = new Date();
			textField.setText(now.toString());
		};
		final int DELAY = 1000;
		// Milliseconds between timer ticks
		Timer t = new Timer(DELAY, listener);
		t.start();

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.pack();
		frame.setVisible(true);
	}
}