不懂，出错了！

src中有两个文件：

一个是：
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
public class MyGameCanvas extends GameCanvas
implements Runnable
{
public MyGameCanvas()
{
super(true);
}
boolean conti=true;
int rate=50;
public void run()
{
long st=0;
long et=0;
Graphics g=getGrapics();
while(conti)
{
st=System.currentTimeMillis();
render(g);
et=System.currentTimeMillis();
if((et-st)<rate)
{
try{
Thread.sleep(tate-(et-st));
}catch(Exception exp){}


}
}
}
int x=50;
int y=10;
public void render(Graphics g)
{
g.setColor(255,255,255);
g.fillRect(0,0,getWidth(),getHeight());
g.setColor(0,0,0);
g.drawString("Test",x,y,0);
x++;
if(x>getWidth())
{
x=0;
flushGraphics();

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

}
public void exit()
{
conti=false;

}
public void keyPressed(int keycode)
{
System.out.println("bit event");

}

}

}



另外一个是：
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class GameMIDlet extends MIDlet
implements CommandListener
{
Display display;
public GameMIDlet();
{
display=Display.getDisplay(this);
}
MyGameCanvas mgc;
public void startApp()
{
if(mgc==null)
{
mgc=new MyGameCanvas();
mgc.addCommand(new Command("start",Command.OK,1));
mgc.addCommand(new Command("end",Command.EXIT,2));
mgc.setCommandListener(this);
display.setCurrent(mgc);
}

}
public void commandAction(Command c,Display s)
{
String cmd=c.getLabel();
if(cmd.equals("start"))
{
mgc.start();

}else if(cmd.equals("end"))
{
mgc.exit();
notifyDestroyed();

}

}
public void pauseApp()
{}
public void destroyApp(boolean unconditional)
{}
}


出错提示是：

Project settings saved

Building "klion"

C:\WTK20\apps\klion\src\MyGameCanvas.java:47: illegal start of expression

public void start()

^

C:\WTK20\apps\klion\src\MyGameCanvas.java:63: ';' expected



^

2 errors

com.sun.kvem.ktools.ExecutionException

Build failed

但是我找不到错呀！高手请指教！