tbdemo.java

图书中的经典例子 好好看看 会有帮助的。java2me版本的

//tbDemo.java file
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class tbDemo extends MIDlet implements CommandListener
{

    private Command exitCommand, aCommand1;
    private TextBox tb;
    private Ticker tker;
    public tbDemo()
    {
        exitCommand =new Command("Exit",Command.EXIT,1);
        aCommand1 =new Command("setTicker",Command.SCREEN,1);
        tker = new Ticker("");
        tb =new TextBox("tbDemo","TextBox",40,0);
        tb.addCommand(exitCommand);
        tb.addCommand(aCommand1);
        tb.setCommandListener(this);
    }
    protected void startApp(  ) throws MIDletStateChangeException
    {
        Display.getDisplay(this).setCurrent(tb);
    }

    protected void pauseApp(  )
    {
    }

    protected void destroyApp( boolean p1 )
    {
    }

    public void commandAction(Command c,Displayable d)
    {
        if (c ==exitCommand)
        {
            destroyApp(false);
            notifyDestroyed();
        }
        else if(c ==aCommand1)
        {
            if(tb.size()==0)
                tb.setTicker(null);
            else
            {
                tker.setString(tb.getString());
                tb.setTicker(tker);
            }
        }
    }
}