精灵问题,请教帮忙!!!!!!!!!!!


//画布:
import   javax.microedition.lcdui.*;
import   javax.microedition.lcdui.game.*;

public   class   ExampleGameSprite   extends   GameCanvas   implements   Runnable
{
private   boolean   isPlay;   //isPlay标志们决定游戏线程是否运行
private   int   Width,Height;   //屏幕的宽度和高度
private   final   static   int   STEP=3;   //人物移动的幅度
private   Sprite   hero=null;   //游戏精灵
private   int   frameWidth,frameHeight;   //精灵的帧宽度和高度
private   int   lastState=-1;   //游戏动作的前一状态，用来设置当前帧

public   ExampleGameSprite()
{
super(true);   //抑制游戏键盘
Width=getWidth();   //获取屏幕宽度
Height=getHeight();
try
{
Image   img=Image.createImage( "/Males_B51.png ");   //加载图片资源
hero=new   Sprite(img,32,48);   //创建精灵
frameWidth=32;   //帧宽度为32像素
frameHeight=48;
}
catch(Exception   e)
{
e.printStackTrace();
}
}
public   void   start()
{
isPlay=true;
Thread   t=new   Thread(this);   //创建游戏线程
t.start();   //启动游戏线程
}
public   void   stop()
{
isPlay=false;   //停止游戏循环
}
public   void   run()
{
Graphics   g=getGraphics();
int   timeStep=100;
while(isPlay)
{
long   start=System.currentTimeMillis();   //获取线程的起始时间
input();   //获取用户输入
draw(g);   //绘制屏幕
long   end=System.currentTimeMillis();   //获取执行完毕的事件
int   duration=(int)(end-start);
if(duration <timeStep)   //如果执行时间小于循环预定时间，则等待到循环时间
{
try
{
Thread.sleep(timeStep-duration);
}
catch(InterruptedException   ie)
{
}
}
}
}
private   void   input()
{
int   keyStates=getKeyStates();   //获取键盘状态
if((keyStates&LEFT_PRESSED)!=0)   //如果用户按下游戏左键
{
if(lastState!=LEFT_PRESSED)   //如果前一状态不是向左
{
lastState=LEFT_PRESSED;
hero.setFrameSequence(new   int[]{3,4,5});   //设置精灵向左的帧序列
//hero.setFrameSequence(new   int[]{4,5,6});
}
else
{
hero.nextFrame();   //精灵自动跳转下一帧
}
if(hero.getX()-STEP> =0)
hero.move(-STEP,0);   //精灵向左移动
else
hero.setPosition(0,hero.getY());   //如果精灵到达左边界，则保持不动
}
if((keyStates&RIGHT_PRESSED)!=0)   //按下向右键
{
if(lastState!=RIGHT_PRESSED)
{
lastState=RIGHT_PRESSED;
hero.setFrameSequence(new   int[]{9,10,11});
//hero.setFrameSequence(new   int[]{10,11,12});
}
else
{
hero.nextFrame();
}
if(hero.getX()+frameWidth <Width)
hero.move(STEP,0);
else
hero.setPosition(Width-frameWidth,hero.getY());
}
if((keyStates&UP_PRESSED)!=0)   //按下向上键
{
if(lastState!=UP_PRESSED)
{
lastState=UP_PRESSED;
hero.setFrameSequence(new   int[]{6,7,8});
//hero.setFrameSequence(new   int[]{7,8,9});

}
else
{
hero.nextFrame();
}
if(hero.getY()-STEP> =0)
hero.move(0,-STEP);
else
hero.setPosition(hero.getX(),0);
}
if((keyStates&DOWN_PRESSED)!=0)   //按下向下键
{
if((lastState!=DOWN_PRESSED))
{
lastState=DOWN_PRESSED;
hero.setFrameSequence(new   int[]{0,1,2});
//hero.setFrameSequence(new   int[]{1,2,3});
}
else
{
hero.nextFrame();
}
if(hero.getY()+frameHeight <Height)
hero.move(0,STEP);
else
hero.setPosition(hero.getX(),Height-frameHeight);