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.