Moving from Std Out in Java

Question

Greetings:
I am working with an application that I am building that basically works with the backend of Java and currently my program uses System.out.printlin() to do the output. This shows me that part 1 is working and I am still and extreme newbie.
Today I started reading the trail on Swing and downloaded the HelloWorldSwing.java file to study and went to compile and it has the following errors:
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldSwing (wron
g name: start/HelloWorldSwing)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: HelloWorldSwing. Program will exit.
Like I said, being a COMPLETE NEWBIE to Java I am not sure how to interpret what went wrong. I simply copied the file down and used javac to compile and tried to run it from the command prompt using 'java HelloWorldSwing'.
I basically want to take the following code:
import java.sql.*;
class NeededLP {
     public static void main(String[] Args) {
          try {
               Class.forName("org.gjt.mm.mysql.Driver").newInstance();
          catch (Exception E) {
               System.err.println("Unable to load driver.");
               E.printStackTrace();
          try {
               java.sql.Connection conn;
               conn = DriverManager.getConnection("jdbc:mysql://10.0.1.6/<mydatabasename>?user<myusername>&password=<mypassword>");
               Statement stmt = conn.createStatement();
               ResultSet rs = stmt.executeQuery("SELECT * FROM `artists` " +
               "JOIN `albums` ON artists.Artist_ID = albums.Artist_ID " +
               "JOIN `statusdef` ON status = statusdef.code " +
               "JOIN `mediadef` ON medium = mediadef.code " +
               "WHERE Status = 0 ORDER BY artists.ArtistName, albums.AlbumName");
               while (rs.next()) {
                    System.out.println(rs.getString(2)+ " " + rs.getString(5) + " " + rs.getString(10) +
                    " " + rs.getString(14));
               rs.close();
               stmt.close();
               conn.close();
          catch (SQLException E) {
               System.out.println("SQLException: " + E.getMessage());
               System.out.println("SQLState:     " + E.getSQLState());
               System.out.println("VendorError:  " + E.getErrorCode());
}And put the output in a nice table in a single window.
Help, as always, is REALLY appreciated. I would like to start by figuring out what happened in the example.
I am using JDK SE.
Thanks,
Mike

Answer 1

Hey There: Thanks for your help so far BTW:
The actual code is from the tutorials from Sun and here is the file as they have it and I made NO changes:
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*   - Redistributions of source code must retain the above copyright
*     notice, this list of conditions and the following disclaimer.
*   - Redistributions in binary form must reproduce the above copyright
*     notice, this list of conditions and the following disclaimer in the
*     documentation and/or other materials provided with the distribution.
*   - Neither the name of Sun Microsystems nor the names of its
*     contributors may be used to endorse or promote products derived
*     from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package start;
* HelloWorldSwing.java requires no other files.
import javax.swing.*;       
public class HelloWorldSwing {
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("HelloWorldSwing");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Add the ubiquitous "Hello World" label.
        JLabel label = new JLabel("Hello World");
        frame.getContentPane().add(label);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
}I think the package is declared as 'start' if I understand what you asked me. Thanks for your patience with me as I try to muddle through learning this on my own :-)