import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JApplet;

public class Lab_5_2lab extends JApplet implements Runnable {
    int w, h;
    int na = 150, dva = 0, k = 0, flag = 1, ra = 0, i, n = 0, flag1 = 0;
    Thread nitka;
    @Override
    public void init() {
        nitka = new Thread(this);
        nitka.start();
    }
    @Override
    public void paint(Graphics g) {
        w = getWidth();
        h = getHeight();
        g.setColor(Color.GREEN);
        g.fillRect(dva, na, 20, h);
        g.setColor(Color.BLACK);
        g.drawRect(dva, na, 20, h);
        if (dva > getWidth() - 10) {
            dva = 0;
            super.paint(g);
        }
    }
    @Override
    public void run() {
        while (true) {
            na -= 5;
            if (na == 0) {
                na = 150;
                dva += 20;
            }
            repaint();
            try {
                Thread.sleep(50);
            } catch (InterruptedException ex) {
            }
        }
    }
}