Praktek Java Mobile

link download : here

====== Membuat file dengan class GameCanvas ==========
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.*;



/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author SaNar
 */
public class UjianKeduaCanvas extends GameCanvas
implements Runnable{
private boolean isPlay; // Game berjalan berulang-ulang ketikan isPlay bernilai true
   private long delay; // memberikan nilai thread secara konsisten
   private int currentX,  currentY; // Membuat posisi awal 'X' dan 'Y'
   private int width; // untuk lebar layar/screen
   private int height; // untuk lebar layar/screen
   private Image image,  imageTemp; //Membuat obyek Image
   private Sprite sprite; //Membuat sprite transparan
    //Membuat sprite tidak transparan
// Constructor dan initialisasi

   public UjianKeduaCanvas() throws Exception
   {
     super(true);
      width = getWidth();
      height = getHeight();
      currentX = width / 2;
      currentY = height = 270;
      delay = 20;
      try
      {
// Load Images untuk Sprites
         image = Image.createImage("/cacing.png");

      }
      catch (Exception ioex)
      {
         System.out.println(ioex);
      }
      sprite = new Sprite(image, 100, 102);

   }
// membuat otomatis start thread untuk game yang berulang-ulang(loop)

   public void start()
   {
      isPlay = true;
      Thread t = new Thread(this);
      t.start();
   }

   public void stop()
   {
      isPlay = false;
   }
// Main Game Loop

   public void run()
   {
      Graphics g = getGraphics();
      while (isPlay == true)
      {
         input();
         drawScreen(g);
         try
         {
            Thread.sleep(delay);
         }
         catch (InterruptedException ie)
         {
         }
      }
   }
// Method untuk menghandle inputan dari keypad

   private void input()
   {
      int keyStates = getKeyStates();
//sprite.setFrame(0);
// Ke Kiri
      if ((keyStates == 4))
      {//& LEFT_PRESSED) != 0) {
         currentX = currentX - 1;
         sprite.setFrame(2);
      }
// Ke Kanan
      else if ((keyStates == 32))//& RIGHT_PRESSED) !=0 )
      {
         if (currentX + 5 < width)
         {
            currentX = currentX + 1;
            sprite.setFrame(0);
         }
      }
// Ke Atas
      if ((keyStates == 2))
      {//{ UP_PRESSED) != 0) {
         currentY = currentY -1;
         sprite.setFrame(3);
      }
// Ke Bawah
      else if ((keyStates == 64))//& DOWN_PRESSED) !=0)
      {
         if (currentY + 10 < height)
         {
            currentY = currentY + 1;
            sprite.setFrame(1);
         }
      }
   }
// Method untuk Display Graphics

   private void drawScreen(Graphics g)
   {
//g.setColor(0xffffff);
      g.setColor(225, 225, 225);
      g.fillRect(0, 0, 0, 0);
// display untuk sprites
      sprite.setPosition(currentX, currentY);
      sprite.paint(g);

      flushGraphics();
   }
}

========= Membuat file dengan class Midlet =========
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.midlet.*;

/**
 * @author SaNar
 */
public class UjianKeduaMidlet extends MIDlet {
    private Display display;

   public void startApp()
   {
      try
      {
         display = Display.getDisplay(this);

// Memanggil class ContohGameCanvas dengan membuat obyek gameCanvas
         UjianKeduaCanvas gameCanvas = new UjianKeduaCanvas();
         gameCanvas.start();
         display.setCurrent(gameCanvas);
      }
      catch (Exception ex)
      {
         System.out.println(ex);
      }
   }

   public Display getDisplay()
   {
      return display;
   }

   public void pauseApp()
   {
   }

   public void destroyApp(boolean unconditional)
   {
   }

   public void exit()
   {
      destroyApp(false);
      notifyDestroyed();

   }
}