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ok I found out my mistake, I was leaving uncommented the main part that calls the constructor inside the new JDialog class, but as I was opening the JDialog from another window, I didn't need the...

I couldn't do it thru the constructor, so after I created the new JDialog instance and opened it, I sent the parameter thru a setMethod.
It also works, so thanks anyway

I want to send a parameter to the new JDialog opening window from the main JFrame window, ie a String.

Hello everyone, from my main window, I am opening a new JDialog window and I want to send a parameter from the main

Opening the new window

ExtensionUI extensionUI = new ExtensionUI(this, true);...