Applet rysujący linie łamane.

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

public class Lamana extends Applet 
{
    int xpoint;
    int ypoint;

    public void init()
	{
		setBackground(Color.BLACK);
	}

	public boolean mouseDown(Event e, int x, int y) 
	{
		Graphics g = getGraphics();
		if(xpoint==0&ypoint==0)
		{
			xpoint = x;
			ypoint = y;   
		}
		else
		{
			g.setColor(Color.white);
			g.drawLine(x,y,xpoint,ypoint);
			xpoint = x;
			ypoint = y;
		}
		return true;
	}
}