package keyTest;import javax.microedition.lcdui.*;import javax.microedition.midlet.*;public class keyTest extends MIDlet implements CommandListener{        private Display display;        private keyTestCanvas myCanvas;        private Command  exitCmd = new Command(" 退出", Command.SCREEN, 1);        public keyTest()        {        	myCanvas = new keyTestCanvas();                display = Display.getDisplay(this);                myCanvas.addCommand(exitCmd);                                                myCanvas.setCommandListener(this);        }        public void startApp()        {                                 display.setCurrent(myCanvas);        }        public void pauseApp()        {        }        public void destroyApp(boolean unconditional)        {        }        public void commandAction(Command cmd, Displayable disp) {        if(cmd == exitCmd){        destroyApp(false);        notifyDestroyed();        }                       }}