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Please post the new code with all the changes.

Please wrap the code in code tags.

Make sure ALL catch blocks have a call to the printStackTrace() method.

One problem I see is that objects are being created every time the actionPerformed() method is called.
Normally only one object is created and it's reused, instead of a new one being created at...

You speak of a chat screen and a server chat screen. Where are they? There is only one program with a main() method.


A problem with the code: it is not responsive when started. The Close...

How do you test the code? I get a window with input areas and buttons. I entered a port and pressed Start Server. The program then hung and I had to cancel it.


Where is the chat screen? There...

Post the code here.

That is one small detail in the design. What about the rest of the design for the project?

What is the chat screen? For example a text area where text can be appended.
What will be displayed in the chat screen?

Please explain what problems you are having.
What do you mean by "connections strings"?

Do you have an overall detailed design for how the programs in this project will work? Is there a server? ...