buystockscreen.java

手机程序股票购买售出的例子

import javax.microedition.lcdui.*;

public class BuyStockScreen extends StockScreen implements CommandListener
{
    public BuyStockScreen(Controller controller)
    {
        super("Buy Stock", controller);

        super.displayScreen();

        this.setCommandListener(this);
    }

    public void commandAction(Command c, Displayable d)
    {
        if ( c == backCommand)
        {
            _controller.lastScreen();
        }
        else
        {
            // buy the shares
            try
            {
                String symbol = _symbolEntry.getString();
                String shares = _numEntry.getString();

                _stockDB.buyStock( symbol, shares, 4);

                _controller.nextScreen( new WelcomeScreen( _controller) );
            }
            catch (StockException se)
            {
                this.setTitle("Bad Data");

                se.printStackTrace();
            }
        }
    }

}