stockscreen.java

手机程序股票购买售出的例子

import javax.microedition.lcdui.*;

public class StockScreen extends Form
{
    private StringItem _symbolField = null;
    private StringItem _numSharesField = null;

    protected TextField _symbolEntry = null;
    protected TextField _numEntry = null;

    protected Command nextCommand = null;
    protected Command backCommand = null;

    protected Controller _controller = null;
    protected StockDatabase _stockDB = null;

    public StockScreen(String title, Controller controller)
    {
        super(title);

        _controller = controller;
        _stockDB = controller.getStockDatabase();
    }

    public void displayScreen(String symbol, int numShares)
    {
        _symbolField = new StringItem("Stock Symbol: ", symbol);
        _numSharesField = new StringItem("Num Shares: ", ""+ numShares);

        append(_symbolField);
        append(_numSharesField);

        generateButtons();
    }

    public void displayScreen()
    {
        _symbolEntry = new TextField("Enter Stock Symbol", "", 6, TextField.ANY);
        _numEntry = new TextField("Enter Num Shares", "", 10, TextField.NUMERIC);

        append(_symbolEntry);
        append(_numEntry);

        generateButtons();
    }

    public void generateButtons()
    {
        this.nextCommand = new Command("Next", Command.SCREEN, 1);
        this.backCommand = new Command("Back", Command.BACK, 1);

        this.addCommand(backCommand);
        this.addCommand(nextCommand);
    }
}