listing 5-2.java

j2me开发大全

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class CheckColor extends MIDlet implements CommandListener
  private Display display;
  private Form form; 
  private TextBox textbox;
  private Command exit; 
  public CheckColor()
  {
    display = Display.getDisplay(this);
    exit = new Command("Exit", Command.SCREEN, 1);
    String message=null;
    if (display.isColor())
    {
      message="Color display.";
    }
    else
    {
     message="No color display";
    }
    textbox = new TextBox("Check Colors", message, 17, 0);
    textbox.addCommand(exit);
    textbox.setCommandListener(this);
  }
  public void startApp()
  {
   display.setCurrent(textbox);
  }
  public void pauseApp()
  {
  }
  public void destroyApp(boolean unconditional)
  {
  }
  public void commandAction(Command command, 
                            Displayable displayable)
  {
   if (command == exit)
   {
     destroyApp(true);
     notifyDestroyed();
   }
  }
}