MIDP2.0提供了對游戲的強有力支持，通過javax.microedition.lcdui.game包，原來在MIDP1.0中很多需要自己寫的功能現在都被當作標準API實現了，包括GameCanvas，SPRite，Layer等等。

我們將使用MIDP2.0編寫一個坦克大戰的手機游戲，我也是初學J2ME不久，預備邊看書邊做，爭取把這個游戲做出來！J2ME高手請多指點，和我一樣學習中的朋友歡迎多多交流！

我們的開發環境為Windows xp SP1 + J2DK1.4 + J2ME WTK2.1 + Eclipse 3.0 + EclipseMe，關于如何配置Eclipse的J2ME開發環境，請參考：

http://blog.csdn.net/mingjava/archive/2004/06/23/24022.aspx

下面是一個最簡單的GameCanvas的例子，出自《J2ME  & Gaming》：

// MyGameCanvas.java
// 編寫Canvas類
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;

public class MyGameCanvas extends GameCanvas implements Runnable {
    private boolean isPlay; // Game Loop runs when isPlay is true
    private long delay; // To give thread consistency
    private int currentX, currentY; // To hold current position of the 'X'
    private int width; // To hold screen width
    private int height; // To hold screen height

    // ConstrUCtor and initialization
    public MyGameCanvas() {
        super(true);
        width = getWidth();
        height = getHeight();
        currentX = width / 2;
        currentY = height / 2;
        delay = 20;
    }

    // Automatically start thread for game loop
    public void start() {
        isPlay = true;
        new Thread(this).start();
    }

    public void stop() { isPlay = false; }

    // Main Game Loop
    public void run() {
        Graphics g = getGraphics();
        while (isPlay) {
            input();
            drawScreen(g);
            try {
                Thread.sleep(delay);
            }
            catch (InterruptedException ie) {}
        }
    }

    // Method to Handle User Inputs
    private void input() {
        int keyStates = getKeyStates();
        // Left
        if ((keyStates & LEFT_PRESSED) != 0)
            currentX = Math.max(0, currentX - 1);
        // Right
        if ((keyStates & RIGHT_PRESSED) !=0 )
            if ( currentX + 5 < width)
                currentX = Math.min(width, currentX + 1);
        // Up
        if ((keyStates & UP_PRESSED) != 0)
            currentY = Math.max(0, currentY - 1);
        // Down
        if ((keyStates & DOWN_PRESSED) !=0)
            if ( currentY + 10 < height)
                currentY = Math.min(height, currentY + 1);
    }

    // Method to Display Graphics
    private void drawScreen(Graphics g) {
        g.setColor(0xffffff);
        g.fillRect(0, 0, getWidth(), getHeight());
        g.setColor(0x0000ff);
        g.drawString("X",currentX,currentY,Graphics.TOPGraphics.LEFT);
        flushGraphics();
    }
}