listing 6-22.java

这是JAVA开发大全的源代码

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class ImmutableImage extends MIDlet  
                            implements CommandListener
{
  private Display display; 
  private Form form; 
  private Command exit; 
  private Image image;
  private ImageItem imageItem;
  public ImmutableImage()
  {
    display = Display.getDisplay(this);
    exit = new Command("Exit", Command.EXIT, 1);
    form = new Form("Immutable Image Example");    
    form.addCommand(exit);
    form.setCommandListener(this);   
    try 
    { 
      image = Image.createImage("myimage.png");
      imageItem = new ImageItem(null, image, 
                      ImageItem.LAYOUT_NEWLINE_BEFORE | 
                      ImageItem.LAYOUT_LEFT | 
                      ImageItem.LAYOUT_NEWLINE_AFTER, "My Image");
     form.append(imageItem);  
    }   
    catch (java.io.IOException error)
    {
     Alert alert = new Alert("Error", "Cannot load myimage.png.", 
                              null, null);
     alert.setTimeout(Alert.FOREVER);
     alert.setType(AlertType.ERROR);
     display.setCurrent(alert);      
    }    
  }
  public void startApp() 
  {
    display.setCurrent(form);
  }
  public void pauseApp()
  {
  }
  public void destroyApp(boolean unconditional)
  {
  }
  public void commandAction(Command command, Displayable Displayable)
  {
    if (command == exit)
        {
          destroyApp(false);
          notifyDestroyed();
        }
  }
}