Gui Q

[WannaJava]

Hello all,

I'm stuck on a project. Its Java based, to do GUI's.

I've written some code which details size, colour, labels and buttons, (but i have not yet assigned tasks to each button)

...

import java.awt.*;

class FirstFrame extends Frame
{



FirstFrame()

{
super("Test Frame GUI");

buildGUI();


setSize(200,60);
setVisible(true);

}



private void buildGUI()
{

Panel top = new Panel();
top.setLayout(new BorderLayout());
top.add(new Label("Load File: "),
BorderLayout.WEST);
top.add(new TextField(),
BorderLayout.CENTER);
top.add(new Button("Load"),
BorderLayout.EAST);

add(top, BorderLayout.NORTH);

add(new TextArea(20,50),
BorderLayout.CENTER);


Panel right = new Panel();
right.setLayout(new GridLayout(3,1));
}
}

First problem is, i'm getting the error message,

"Exception in thread "main" java.lang.NoClassDefFoundError: TestFrame"

Can anyone let me know what thats about?

The end result will be that i'll need to set it up to return a Truth Table for a user inputted mathematical equation! If anyone can help out with that as well that be great!

WannaJava

[awoodland]

"Exception in thread "main" java.lang.NoClassDefFoundError: TestFrame"

Well that exception means that when you tried to invoke the program it couldnt actualy find the class you told it to start the main method in. This is quite often caused by either a) trying to run a class from a package which isnt the default one in correctly or b) File name cases or c) class path problems

In your case my guess would be that eithre you have got the cases in the filename wrong (should be FirstFrame.java) or that you don't have . in your class path. (Dot represnts the current directory)

Alan

[WannaJava]

Originally posted by awoodland
In your case my guess would be that eithre you have got the cases in the filename wrong (should be FirstFrame.java) or that you don't have . in your class path. (Dot represnts the current directory)

Hello,

Thanks for taking the time to reply.

About this you wrote, in practice what does this mean for me. How will i change my code to correct it?

Sorry if it seems all very beginner, but it's got me stumped for a while now

Thanks in advance, WJ