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import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.GameCanvas;


public class gameStart extends MIDlet {
  public GameCanvas gc;
  public Display d;
  public static gameStart midlet;
public gameStart() {
// TODO Auto-generated constructor stub
super();
midlet=this;
d=Display.getDisplay(this);

}

protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
// TODO Auto-generated method stub

}

protected void pauseApp() {
// TODO Auto-generated method stub
   
}

protected void startApp() throws MIDletStateChangeException {
// TODO Auto-generated method stub
  if(gc==null){
  gc=new GameCanvas();
  gc.gameState=GameCanvas.MENU;
  d.setCurrent(gc);
  }else{
  d.setCurrent(gc);
  }
}

}


------解决方案--------------------
楼主想让我们帮你看语法错误吗？你怎么不把什么报什么错贴出来？