Applet symulujący ruch flagi Polski.

import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;

public class AppletRuch extends Applet implements Runnable 
{
	private int m_X = 60, m_Y = 0, m_oldX, m_oldY;
    private Thread wateczek;

	public void init() 
	{
		setBackground(Color.black);
		m_oldX = m_X;
		m_oldY = m_Y;
	}

	public void start() 
	{
		if (wateczek == null)
			wateczek = new Thread(this, "Rysownik");
		wateczek.start();
	}

	public void stop() 
	{
		if (wateczek != null)
		{
			wateczek.stop();
			wateczek = null; 
		}
	}

	public void run() 
	{
		boolean gora = false;
		while (Thread.currentThread() == wateczek) 
		{
			if(m_Y < 0)
			m_Y=101;
			m_Y--;
			repaint();
			try 
			{
				Thread.sleep(50);
			} 
			catch(InterruptedException ex) 
			{}
		}
	}

	public void paint(Graphics g) 
	{
		update(g);
	}
	
	public void update(Graphics g) 
	{
		if ((m_oldX != m_X) | (m_oldY != m_Y)) 
		{
			g.setColor(Color.black);  
			g.drawRect(40,m_oldY,180,60);
			g.fillRect(40,m_oldY,180,60);
			g.drawRect(40,m_oldY+60,180,60);
			g.fillRect(40,m_oldY+60,180,60);
			m_oldY = m_Y;
		}
		g.setColor(Color.white);
		g.drawRect(40,m_Y,180,60);
		g.fillRect(40,m_Y,180,60);
		g.setColor(Color.red);
		g.drawRect(40,m_Y+60,180,60);
		g.fillRect(40,m_Y+60,180,60);
		g.setColor(Color.white);
	}
}