Implimenting GUI into main class

Hello all, I'm trying to figure out how to create a GUI for a program I'm writing.
Basically, the program I'm making allows a user to search through a list of movies that have been entered into a database (a textfile). The movie objects have a Title, Description, Genre, and a Rating.
I'm a little confused as to how I should set up all my code. I've written most of the background code to sort and search the movie objects, and I've also written most of the code to display the GUI. I just don't really know how to link them both.
Here's my question. I have a GUI class that currently has a main method, which calls run(), which then calls createAndShowGUI(), a method of the GUI class. Is this the right way to do things?
I also have a MovieSorter class, which creates an ArrayList of movieObjects, with the information taken from the text file. Unfortunatly, this too has a main method. So right now I can run the program from either class, to get the GUI to display, or to get the functional program to run. I don't know how to combine them.
I'm assuming I will have the main method be in the MovieSorter class, that will call the createAndShowGUI method, which will then display the GUI. Then the GUI listens for any input (buttons, etc) and calls the appropriate methods accordingly. Is this right?
I guess my main question is am I supposed to have a GUI object that I somehow put inside a JFrame (the GUI object being a JPanel or something)? I don't really know how the program is supposed to flow.
Thanks!
EDIT I can attach the code if you like, but it's a bit long.
Edited by: lifeismusic434 on Oct 22, 2008 6:57 PM

My take on something like this is that I look on the GUI as the View, and the non-GUI class as the Model. I suppose the program will be started by some Control object that will start up the GUI and start up the Model and link the two. Without more specifics, I'm afraid that that's the best that I can do. Hopefully someone else will give you more helpful advice.

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return false;
device.SetDataFormat(DeviceDataFormat.Joystick);
device.SetCooperativeLevel(this, CooperativeLevelFlags.Exclusive | CooperativeLevelFlags.Background);
device.Properties.AxisModeAbsolute = true;
device.Properties.AutoCenter = false;
device.Acquire();
// Enumerate any axes
foreach(DeviceObjectInstance doi in device.Objects)
if ((doi.ObjectId & (int)DeviceObjectTypeFlags.Axis) != 0)
// We found an axis, set the range to a max of 10,000
device.Properties.SetRange(ParameterHow.ById,
doi.ObjectId, new InputRange(-5000, 5000));
// Load our feedback file
EffectList effects = null;
effects = device.GetEffects(@"C:\MyEffectFile.ffe",
FileEffectsFlags.ModifyIfNeeded);
foreach(FileEffect fe in effects)
EffectObject myEffect = new EffectObject(fe.EffectGuid, fe.EffectStruct,
device);
myEffect.Download();
effectList.Add(myEffect);
while(running)
UpdateInputState();
Application.DoEvents();
return true;
public void PlayEffects()
// See if our effects are playing.
foreach(EffectObject myEffect in effectList)
//if (button0pressed == true)
//MessageBox.Show("Button Pressed.");
// myEffect.Start(1, EffectStartFlags.NoDownload);
if (!myEffect.EffectStatus.Playing)
// If not, play them
myEffect.Start(1, EffectStartFlags.NoDownload);
//button0pressed = true;
protected override void OnClosed(EventArgs e)
running = false;
private void UpdateInputState()
PlayEffects();
// Check the joystick state
JoystickState state = device.CurrentJoystickState;
device.Poll();
joyState = "Using JoystickState: \r\n";
joyState += device.Properties.ProductName;
joyState += "\n";
joyState += device.ForceFeedbackState;
joyState += "\n";
joyState += state.ToString();
byte[] buttons = state.GetButtons();
for(int i = 0; i < buttons.Length; i++)
joyState += string.Format("Button {0} {1}\r\n", i, buttons[i] != 0 ? "Pressed" : "Not Pressed");
label1.Text = joyState;
//if(buttons[0] != 0)
//button0pressed = true;
public Form1()
// Required for Windows Form Designer support
InitializeComponent();
// TODO: Add any constructor code after InitializeComponent call
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
if( disposing )
if (components != null)
components.Dispose();
base.Dispose( disposing );
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
public void InitializeComponent()
this.label1 = new System.Windows.Forms.Label();
this.SuspendLayout();
// label1
this.label1.BackColor = System.Drawing.SystemColors.ActiveCaptionText;
this.label1.Location = new System.Drawing.Point(8, 8);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(272, 488);
this.label1.TabIndex = 0;
// Form1
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.BackColor = System.Drawing.SystemColors.ControlText;
this.ClientSize = new System.Drawing.Size(288, 502);
this.Controls.AddRange(new System.Windows.Forms.Control[] {
this.label1});
this.Name = "Form1";
this.Text = "Joystick Stuff";
this.ResumeLayout(false);
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
using (Form1 frm = new Form1())
frm.Show();
if (!frm.InitializeInput())
MessageBox.Show("Couldn't find a joystick.");

Imho he means the following.
Your class has performs two tasks:
Controlling the joystick.
Managing the joystick with a form.
So I would recommend, that you separate the WinForm from the joystick code. E.g.
namespace JoystickCtlLib
public class JoystickControl
private Device device = null;
private bool running = true;
private ArrayList effectList = new ArrayList();
private string joyState = "";
public string State { get { return this.joyState; } }
public bool InitializeInput() { return true; }
public void PlayEffects() { }
private void UpdateInputState() { }
So that your joystick class does not reference or uses any winform or button.
btw, there is a thing which is more important than that: Your polling the device in the main thread of your application. This will block your main application. Imho this should be a job for a thread like background worker.

Could not find the main class: projectRFID.ProjectGUI. Program will exit.

Hello,
I'm quite new in Java. I have an application with GUI. When I'm using Eclipse version 3.4.0 to run the application, all it is working perfect.
But after I generate the jar from Eclipse, using the manifest file option from there and added the ProjectGUI to it, where is the main class, and try to run from the command line I receive the next error:
root@slax:~/workspace# java -jar rfid.jar
Exception in thread "main" java.lang.NoClassDefFoundError: projectRFID/ProjectGUI
Caused by: java.lang.ClassNotFoundException: projectRFID.ProjectGUI
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: projectRFID.ProjectGUI. Program will exit.
root@slax:~/workspace#
I run this application on a SLAX system with jdk6 update 7.
I tried to generate the jar file even from the command line using the manifest file option but I still receive the same error.
I hope somebody can help me!
Thank you!

cojogrizli wrote:
The structure of my project in Eclipse is src/project/files.java and in jar file is src/files.java bin/class.java Dati/ and META-INF/.That's wrong. You don't need the .java files in the jar (but you can have them, if you want, they are just not used by Java).
And each .class file must be in a directory that reflects its package. So in your example ProjectGUI.class must be in the directory projectRFID/ inside the .jar file.

Could not find the main class - Problem with Webservice-Access

Hello Everybody,
I'm having serious Problems with accessing a WebService (Tomcat-Axis) per executable jar-File.
I constructed a simple GUI with 3 Textboxes 1 Button and 1 Resultbox.
I use eclipse so it was no Problem to simple generate the Backgroundclient by Processing the .wsdl-File of the WS.
Now I do this:
Head_tServiceLocator serviceLocator = new Head_tServiceLocator();
Head_t service = serviceLocator.getRPCCall();
RPCCallSoapBindingStub Head_t = (RPCCallSoapBindingStub) service;and use the Webservice like an Object.
All this works very well.
Now the Problem:
Head_t service = serviceLocator.getRPCCall();this Line has to throw a ServiceException.
If i add a try-catch Block to Process the Message JAVA tells me after i exported to JAR (with Manifest-stuff and so on) and double Click on the JAR the following :
Could not find the main Class - Program will exit.
And if i add a throws Declaration to the Methodheader it tells me:
Fatal Exception Occured - Program will exit
But if i Comment out that Line at least the GUI is being displayed (so it DOES find the main-Class). But then of course the Webservice won't be accessed.
All the JARs needed (axis.jar, commons-discovery.jar and so on) are in the same Directory as the Webservice-Client.jar
Please Help me.
Greets,
Zap

I am not done any typing mistake while creating the jar file i already followed the suggestion that you have mentioned but still the same error .
This is my MANIFEST.MF file created under META-INF folder
Manifest-Version: 1.0
Class-Path: qtjambi-4.4.3_01.jar qtjambi-win32-msvc2005-4.4.3_01.jar
Created-By: 1.5.0 (Sun Microsystems Inc.)
Main-Class: Ui_MainWindow
When i extracted the app.jar following this i got
1. META-INF folder inside that MAINFEST.MF file the contents i have already placed above
2. qtjambi-4.4.3_01.jar
3. qtjambi-win32-msvc2005-4.4.3_01.jar
4. Ui_MainWindow.class
Please tell me whats wrong in that i can also give you the app.jar file please let me know the email id ..

"Could ntot find the main class : PdfToImage"

I am trying to produce a jar that I can execute from the command line. Currently it executes fine if I hit F6 to run the code in the Netbeans IDE.
I read this article:
     http://java.sun.com/developer/Books/javaprogramming/JAR/basics/run.html
but still can't get it to run from the command line. The error I get when clicking on the jar file is:
"Could not find the main class PdfToImage"
The source code is this:
package converttoimage2;
...import statements here
public class PdfToImage{
     public static void main(String[] args) {
To build a jar file I navigated to the NetbeansProjects folder and typed the following (is this wrong?)
     jar cfm PdfToImage.jar ConvertToImage2\manifest.mf ConvertToImage2
No error messages occured here. The manifest file originally was this (BTW I don't understand what that X-comment is trying to say)
     Manifest-Version: 1.0
     X-COMMENT: Main-Class will be added automatically by build
so I added this line:
     Main-Class: PdfToImage
and yes, I pressed Enter at the end of this line. This is the manifest that generates the error. I get the same error this way:
     Main-Class: converttoimage2.PdfToImage
The code I'm using from the Windows command line to execute the jar (after I copy the jar file to the c-drive) is this:
     java -jar C:\PdfToImage.jar
This errors out with
     Could not find the main class: PdfToImage
I've also tried this;
     java C:\PdfToImage.jar
The next thing i tried was to navigate to the class folder containing the PdfToImage.class. I copied the manifest into this class folder as well.From there I typed:
     jar cfm PdfToImage.jar manifest.mf PdfToImage
This produced a jar file with no error messages, but I get the original error messsage when I try to execute. Also I doubt this last jar file is complete since it is only 2KB in size (My code references a library called PdfRenderer which is a 2MB jar).
I'm completely lost here.

I am trying to produce a jar that I can execute from the command line. Currently it executes fine if I hit F6 to run the code in the Netbeans IDE.You can make a jar from NetBeans, "Build > Build Main Project" (Shortcut - F11). Or right click the project in the project window and select "Build".
I read this article:
     http://java.sun.com/developer/Books/javaprogramming/JAR/basics/run.html
OK, if you want to create a jar without Netbeans, then following link would help you a lot:
[http://java.sun.com/docs/books/tutorial/deployment/jar/index.html]
Thanks!

The manifest file "could not find the main class."

The main class file is inside a folder in the created Jar file, but is not in a package. But when I double-click the Jar file, it says it could not find the main class. I am using Windows. I have tried each of the following lines in the manifest, but none are working:
Main-Class: Installer
Main-Class: setupFiles/programFile/Installer
Main-Class: setupFiles\programFile\Installer
Main-Class: setupFiles.programFile.InstallerThe main class is inside the setupFiles/programFile directory. Please Help!
Thanks in advance,
~ Tom

Hi Tom,
The main class file is inside a folder in the created
Jar file, but is not in a package. This is the problem. A JAR file is not an arbitrary ZIP file, where you can arrange directories as you like. The structure of a JAR file always has to follow the package structure. So your Installer class must be on the top level and not in directory setupFiles/programFile.
You might add non-class files in other directores and can access them as resources, but you have to put the class files into their "natural" directories.

Implimenting GUI into main class

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