problems with swing example program

[mr_sandman]

Im writing a simple gui program i found in the java complete reference book. the code as far as i can tell is a carbon copy of whats found in the book. however i always get a runtime error when i run it.


The code:

package swing1;

import javax.swing.*;

class SwingDemo {

SwingDemo() {JFrame jfrm = new JFrame("a simple swing application");
jfrm.setSize(275, 100);
jfrm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
JLabel jlab = new JLabel("Swing means powerful GUIs");
jfrm.add(jlab);
jfrm.setVisible(true);}

public static void main(String args[]) {
SwingUtilities.invokeLater(new Runnable() {
public void run() { new SwingDemo();
}
});
}
}

the error:

Exception in thread "main" java.lang.NoClassDefFoundError: swing1/Main
Caused by: java.lang.ClassNotFoundException: swing1.Main
at java.net.URLClassLoader$1.run(URLClassLoader.java: 202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 07)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 48)
Java Result: 1

any ideas of what is causing this error?

thanks

[Junky]

How are you running the program? If it is on the command line then post the command you use and your working directory.

[mr_sandman]

ive been running it using netbeans would you suggest running it on the command line?

[Junky]

You need to modify Netbeans run command. It is trying to run a class called Main but your class is called SwingDemo.

[mr_sandman]

thanks got it running