Short Example of Fullscreen Graphics

[Sergio Campos J.]

import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
import java.util.Random;

public class RandomLines extends MIDlet implements CommandListener {
    private Display display;

    protected void startApp() {
        Canvas myCanvas = new LineCanvas();
        myCanvas.setFullScreenMode(true);
        display = Display.getDisplay(this);
        display.setCurrent(myCanvas);
    }

    protected void pauseApp() {}
    protected void destroyApp(boolean unconditional) {}
    public void commandAction(Command c, Displayable d) {
        notifyDestroyed();
    }
}
// HERE COMES THE CANVAS... THE CORE OF THE THING...
class LineCanvas extends Canvas {
    public void paint(Graphics g) {
        Random RandomGenerator = new Random ();
        int x1; int y1; int x2; int y2; int i; 
        int width = getWidth(); int height = getHeight();
        // Fill the background using black
        g.setColor(0); g.fillRect(0, 0, width, height);

        for (i=1; i<1000; i++){ //  Random lines in random colors
            x1 = (int)(RandomGenerator.nextInt() % width) + 1;
            x2 = (int)(RandomGenerator.nextInt() % width) + 1;
            y1 = (int)(RandomGenerator.nextInt() % height) + 1;
            y2 = (int)(RandomGenerator.nextInt() % height) + 1;
            g.setColor((int)(RandomGenerator.nextInt() % 0xFFFFFF) + 1);
            g.drawLine(x1, y1, x2,y2);
        }
    }
}

As short as my poor knowledge has permitted.
Hope it can be helpful for beginners.
(must be written in a file called RandomLines.java)