import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class FinalExample extends JPanel {
	private static final Color[] colors = {Color.RED, Color.GREEN, Color.BLUE};
	private int c = 0;
	
	public FinalExample() {
		setPreferredSize(new Dimension(200, 70));
		JButton button  = new JButton("Push");
		button.setForeground(colors[c]);
		button.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				c = (c + 1) % colors.length;
				button.setForeground(colors[c]);
			}
		});
		setLayout(new FlowLayout());
		add(button); 
	}

	public static void main(String[] args) {
		SwingUtilities.invokeLater(() -> {
			JFrame frame = new JFrame("Final Example");
			frame.add(new FinalExample());
			frame.pack();
			frame.setVisible(true);
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		});
	}
}