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Question about empty frame

 
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I use swing JFrame now,and want to activate another Frame after press the button on the original one, but my program ran very wield, that my new frame showed up but I can not see anything on it. But if I move the size of the frame, then everything on the frame showed up.

could any of you guys can figure out what's wrong with me Frame?

I used setVisible(true) and setSize(300, 300) in the end of frame launch mathod.
 
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This seems to be a layout problem.

*Which layout are you using?
*Please check what is the default JFrame Layout.
*before showing the frame call validate().
 
Nick Lee
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I'm using grad Layout now

I don't know validate(), what's class method is this?
 
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