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The SwingBuilder means that I can just write words like frame, label, and textField, and, through the magic of metaprogramming, they are interpreted by the builder as Swing components. The other great part is that Groovy doesn’t force you to create an inner class just to hold a method. Closures are perfectly valid objects in their own right, so I can just assign one to the actionPerformed property of the text field, and I’m all set.