What are the difference in Dialog display in lwuit? [closed]

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In Lwuit Dialogs, I have seen .show() , .showDialog() , .showModeless() and .showPacked(String, boolean) .

What are the difference between these. And when I use a dialog, until the dialog goes the background process not running. Is there any solution for that.

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Look at the Dialog javadoc. Here clearly described what they are and where it will be use.