MIDP1.0-五子棋1.1读后的修改

          首先感谢yinnowl提供的文章MIDP1.0-五子棋1.1，我是一个J2ME的初学者，看了yinnowl的这篇文章后，有些自己的想法，所以就冒昧和大家分享，请大家批评指正。

           我的思路是把MIDP1.0-五子棋1.1改成在MIDP2.0上实现，同时感觉原文在判定胜败的时候比较慢做了下优化，原文链接请点击这里。

           关于具体的解释，原文已经都有，我这也不敢班门弄斧，只给出我自己用到的4个类：
1.MIDlet 主类Gobang.java     
package hero;

import javax.microedition.midlet.MIDlet;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Image;

public class Gobang
    extends MIDlet
     {

  startForm startform;
  PRivate Display dispaly;
  public static  Gobang instance;

  public Gobang() {
    instance = this;
    dispaly = Display.getDisplay(this);
  }

  protected void startApp() {
   startform = new startForm();
    dispaly.setCurrent(startform);

  }

  protected void pauseApp() {

  }

  protected void destroyApp(boolean uncondition) {

  }

 protected void quitApp(){
   instance.destroyApp(true);
    instance.notifyDestroyed();
    instance = null;

 }

  //读取并添加图片
 public static Image createImage(String name) {
   Image aImage = null;
   try {
     aImage = Image.createImage(name);
   }
   catch (Exception e) {
   }
   return aImage;
 }

}
2.棋子类 Chesses .java
package hero;

public class Chesses {
  boolean isPlayer1;
 public Chesses(){

 }

 public Chesses(boolean isPlayer1) {
        this.isPlayer1=isPlayer1;
    }

}
3.图形加载类  startForm.java  （一个过渡界面）
package hero;

import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.ImageItem;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;

public class startForm extends Form implements CommandListener {
  private static Command exitCmd;
  private static Command okCmd;
  private Image startImage;
 protected Gobang gobang;
 private GobangCanvas gobangcanvas;
  //显示程序的启动画面//
  public startForm() {
    super("");
    okCmd = new Command("进入", Command.OK, 1);
    exitCmd = new Command("离开", Command.EXIT, 1);