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Please Edit your post and wrap your code with
<YOUR CODE HERE> to get highlighting

You can call methods on an object any time after you have created an instance of it.
Try adding the call to...

Call that method before calling the setVisible() method for the frame.

Look at the API doc for the classes you are using and see it there are any methods to call that will do what you want. Then call those methods when you want them to be executed.