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imageobserver runtime error

vijay Krishnan
Greenhorn

Joined: Jul 27, 2006
Posts: 14
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

// This applet displays a single image twice,
// once at its normal size and once much wider.

public class ImageDisplayer extends JApplet {

static String imageFile = "D:/vijay_dreams/JavaExamples/pegeon.gif";

public void init() {
Image image = getImage(getCodeBase(), imageFile);
ImagePanel imagePanel = new ImagePanel(image);
getContentPane().add(imagePanel, BorderLayout.CENTER);
}
}

class ImagePanel extends JPanel {


Image image;

public ImagePanel(Image image) {

this.image = image;
}

public void paintComponent(Graphics g) {
super.paintComponent(g); // Paint background

// Draw image at its natural size first.
g.drawImage(image, 0, 0, this); //85x62 image

// Now draw the image scaled.
g.drawImage(image, 90, 0, 300, 62, this);
}
}

**************************************
The above pgm gives me and runtime error as,

/* Exception in thread "main" java.lang.NoSuchMethodError: main */

can anyone explain why?


Thanks and Regards,
viji.
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 42608
    
  65
How are you trying to run this? Applets are referenced in an applet tag inside of an HTML page. They can't be run from the command line via the "java" command.

Note that applets do not have access to the local file system, so you will have to sign it, or fiddle with the local security policy.

If you want to run this applet as an application, check out the MainFrame class.
[ December 28, 2006: Message edited by: Ulf Dittmer ]

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It is sorta covered in the JavaRanch Style Guide.
 
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