Code Stop working after converting to jar?

I made a simple code that creates a form with a Textbox and a button and an ActionListener
that make a message of the Textbox show when pressing the button. it works on eclipes but when i converting
it to a jar the form open but when i press on the buttn Nothing Happens...
This is my code:

Code :

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import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class hello {
	public static void main(String args[]){
     final JTextField Textbox = new JTextField(16);
	 JFrame frame = new JFrame("Java app");  
	  JButton button = new JButton("Send Command");
	  JPanel panel = new JPanel();
	    panel.add(button);
	   panel.add(Textbox);
	    frame.add(panel);
	    frame.setSize(500, 400);
	    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	    frame.setVisible(true);    
   button.addActionListener(new ActionListener(){
   	public void actionPerformed(ActionEvent ae){
   		JOptionPane.showMessageDialog(null, Textbox.getText());
     }
   });
}
}

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how can i fix it?

Quote:

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when i press on the buttn Nothing Happens

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Are there any error messages? Please copy and paste them here.
To see the error messages, open a command prompt window, go to the folder with the jar file and enter:
java -jar YOURJARFILENAME.jar

Then copy the contents of command prompt window:
To copy the contents of the command prompt window:
Click on Icon in upper left corner
Select Edit
Select 'Select All' - The selection will show
Click in upper left again
Select Edit and click 'Copy'

Paste here.

Thank you very very much [: i found the Problem it was Because I did not put the second part of the class when i created the jar...