welcomescreen.java

手机程序股票购买售出的例子

//WelcomeScreen
import javax.microedition.lcdui.*;
import java.util.*;

public class WelcomeScreen extends List implements CommandListener
{
    private Command readCommand = null;
    private Command replyCommand = null;

    private Controller _controller = null;

    public WelcomeScreen(Controller controller)
    {
        super("Welcome", List.IMPLICIT);

        _controller = controller;

        Ticker ticker = new Ticker("Thank you for viewing the Stock Application Example");

        this.setTicker( ticker);

        initialize();
    }

    private void initialize()
    {
        append("Buy Stock", null);
        append("Sell Stock", null);

        this.setCommandListener(this);
    }


    public void commandAction (Command c, Displayable d)
    {
        if (d == this) {
            if ( c == List.SELECT_COMMAND)
            {
                List shown = (List) _controller.currentScreen();

                switch (shown.getSelectedIndex())
                {
                    case 0:
                        _controller.nextScreen( new BuyStockScreen( _controller) );
                        break;
                    case 1:
                    default:
                        _controller.nextScreen( new SelectStockScreen(_controller) );
                }
            }
        }
        else
        {
            System.out.println("on another screen");
        }
    }
}