semafor

import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;

public class Semafor extends JPanel {

    Timer timer;
    private int seconds = 1;
    private int stav;
    private boolean left_broken = false;

    public Semafor () {
        setBounds(125,50,100,200);
        timer = new Timer(1000, new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    if (seconds % 4 == 1) {
                        stav = 1;
                    } else if (seconds % 4 == 2 || seconds % 4 == 0){
                        stav = 2;
                    } else if (seconds % 4 == 3){
                        stav = 3;
                    }
                    System.out.println("Time in seconds : " + seconds);
                    repaint();
                    seconds++;

                }
            });
        timer.start();
    }

    public void mousePressed(MouseEvent e) {
       System.out.println("Mouse pressed; # of clicks: ");
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(Color.black);
        g.fillRect(0, 0, 100, 200);
        if (stav == 1 || stav == 0){
            g.setColor(Color.red);
            g.fillOval(30, 20, 40, 40);
            g.setColor(Color.white);
            g.fillOval(30, 80, 40, 40);
            g.setColor(Color.white);
            g.fillOval(30, 140, 40, 40);
        } else if (stav == 2) {
            g.setColor(Color.white);
            g.fillOval(30, 20, 40, 40);
            g.setColor(Color.orange);
            g.fillOval(30, 80, 40, 40);
            g.setColor(Color.white);
            g.fillOval(30, 140, 40, 40);
        } else if (stav == 3){
            g.setColor(Color.white);
            g.fillOval(30, 20, 40, 40);
            g.setColor(Color.white);
            g.fillOval(30, 80, 40, 40);
            g.setColor(Color.green);
            g.fillOval(30, 140, 40, 40);
        }

    }


}