sellstockscreen.java

手机程序股票购买售出的例子

import java.util.Vector;
import javax.microedition.lcdui.*;

public class SellStockScreen extends StockScreen implements CommandListener
{
    private String _symbol = null;
    private int _numShares = 0;

    private Stock _sellStock = null;

    public SellStockScreen(Controller controller, String selectedStock)
    {
        super("Sell "+ selectedStock, controller);

        append("Selling " + selectedStock);

        try
        {
            // determine how many shares the user has
            _sellStock = _stockDB.getStock( selectedStock);

            _symbol = _sellStock.getSymbol();
            _numShares = _sellStock.getNumShares();

            // display screen
            super.displayScreen(_symbol, _numShares);

            this.setCommandListener( this);

        }
        catch (StockException se)
        {
            System.out.println("EXCEPTION "+ se.getMessage() );
        }
    }

    public void commandAction( Command c, Displayable d)
    {
        if ( c == backCommand)
        {
            _controller.lastScreen();
        }
        else
        {
            // sell the shares
            try
            {
                _stockDB.sellStock( _sellStock, _numShares);
            }
            catch (StockException se)
            {
                se.printStackTrace();
            }

            _controller.nextScreen( new WelcomeScreen( _controller) );
        }
    }
}