Java ME中的是/否对话框

import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.ItemCommandListener;
import javax.microedition.lcdui.StringItem;

public class MyForm extends Form implements ItemCommandListener {
    private StringItem question;

    public MyForm() {
        super("是/否对话框示例");

        question = new StringItem("您喜欢这个对话框吗？", null);
        append(question);

        addCommand(new Command("是", Command.OK, 1));
        addCommand(new Command("否", Command.CANCEL, 1));
        setCommandListener(this);
    }

    public void commandAction(Command c, Displayable d) {
        if (c.getCommandType() == Command.OK) {
            question.setText("您喜欢这个对话框吗？\n\n答案：是");
        } else if (c.getCommandType() == Command.CANCEL) {
            question.setText("您喜欢这个对话框吗？\n\n答案：否");
        }
    }
}