listing 6-16.java

j2me开发大全

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class StringItemExample extends MIDlet 
                               implements CommandListener
{
  private Display display;
  private Form form; 
  private StringItem question; 
  private Command giveup; 
  private Command exit; 
  public StringItemExample()
  {
    display = Display.getDisplay(this);
    question = new StringItem("Question: ", 
               "A plane crashes on the border between Canada 
                and the US. Where are the survivors buried?");
    giveup = new Command("Give Up", Command.SCREEN, 1);
    exit = new Command("Exit", Command.EXIT, 1);
    form = new Form("Quiz");    
    form.addCommand(exit);
    form.addCommand(giveup);    
    form.append(question);
    form.setCommandListener(this);   
  }
  public void startApp()
  {
    display.setCurrent(form);
  }
  public void pauseApp()
  { 
  }
  public void destroyApp(boolean unconditional)
  { 
  }
  public void commandAction(Command command, Displayable displayable)
  {
    if (command == giveup)
    {
      question.setLabel("Answer: ");
      question.setText("Survivors are not buried."); 
      form.removeCommand(giveup);
    }
    else if (command == exit)
    {
     destroyApp(false);
     notifyDestroyed();
   }
  }
}