listing 7.19.java

j2me开发大全

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class ImmutableImageExample extends MIDlet
{
  private Display  display;     
  private MyCanvas canvas;   
  public ImmutableImageExample ()
  {
    display = Display.getDisplay(this);
    canvas  = new MyCanvas (this);
  }
  protected void startApp()
  {
    display.setCurrent( canvas );
  }
  protected void pauseApp()
  { 
  }
  protected void destroyApp( boolean unconditional )
  { 
  }
  public void exitMIDlet()
  {
    destroyApp(true);
    notifyDestroyed();
  }
  class MyCanvas extends Canvas implements CommandListener
  {
    private Command exit;  
    private ImmutableImageExample immutableImageExample;
    private Image image = null;
    public MyCanvas (ImmutableImageExample immutableImageExample)
    {
      this. immutableImageExample = immutableImageExample;
      exit = new Command("Exit", Command.EXIT, 1);
      addCommand(exit);
      setCommandListener(this);
      try
      {
        image = Image.createImage(