CODEWITHSUNDEEP
javaapplet
Kevin Schultz
Kevin Schultz

Reputation: 884

Cant' use my applet because of No applet found error

I am writing a program for a class where I need to have the american flag scale the flag pole to the national anthem. I have the code but get an error that the applet is not found even though its there. I am using eclipse. Can anyone help me with what I am missing?

Thanks in advance...

Code:

@SuppressWarnings("serial")
public class Lab5b extends JApplet {
  private AudioClip audioClip;

  public Lab5b() {
    add(new ImagePanel());

    URL urlForAudio = getClass().getResource("audio/us.mid");
    audioClip = Applet.newAudioClip(urlForAudio);
    audioClip.loop();
  }

  public void start() {
    if (audioClip != null) audioClip.loop();
  }

  public void stop() {
    if (audioClip != null) audioClip.stop();
  }

  /** Main method */
  public static void main(String[] args) {
    // Create a frame
    JFrame frame = new JFrame("Lab 5");

    // Create an instance of the applet
    Lab5b applet = new Lab5b();
    applet.init();

    // Add the applet instance to the frame
    frame.add(applet, java.awt.BorderLayout.CENTER);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // Display the frame
    frame.setSize(200, 660);
    frame.setVisible(true);
  }
}

@SuppressWarnings("serial")
class ImagePanel extends JPanel {
  private ImageIcon imageIcon = new ImageIcon("image/us.gif");
  private Image image = imageIcon.getImage();
  private int y = 550;

  public ImagePanel() {
        Timer timer = new Timer(120, new TimerListener());
        timer.start();
    }

    class TimerListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            increaseY();
        }
    }


  public void increaseY() {
        if (y > 0) {
            y--;
            repaint();
        }
    }

  /** Draw image on the panel */
  protected void paintComponent(Graphics g) {
    super.paintComponent(g);

    if (image != null) {
      g.fillRect(0, 0, 10, 660);
      g.drawImage(image, 11, y, 160, 84, this);
        }
  }
}

Upvotes: 1

Views: 259

Answers (1)

tmwanik
tmwanik

Reputation: 1661

Several things to note

  • Applets do not begin execution at main() method. However, it is possible to execute the applets by using the Java interpreter (by using the main() method) if you extend your class with Frame.

  • It is important to have the init() method since it is called by the browser or applet viewer to inform this applet that it has been loaded into the system. It is always called before the first time that the start method is called.

  • JFrame and JApplet are all top level containers and instead of adding the applet to the frame, i would rather create an object of JPanel since it can be added to both JFrame/JApplet. In your case just add ImagePanel to either of the top level container.

  • I/O Streams do not provide much scope for applets.

  • It is not possible for an applet to access the files on the users hard disk.

Read more here

Upvotes: 1

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