JFrame not defined

I'm trying to create a execution preview like shapes.  I don't see any documentation, but I'm trying to following the shapes project.  The Swing types are not available in my code though.  For example, in a concept behavior creating a JFrame frame give an error.


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Press Ctrl+R (possibly twice) and then search for JFrame. When you select the one you need, it will import that part of the java stubs for you that you need.


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