java - How can I keep a JFrame to specific width and height? -

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i made 840 400 frame , added text field. default, java app shrinked size of text field. want fixed respective size.

i tried setresizable(false), setextendedstate(), setbounds() no avail.

try 

 setpreferredsize(new dimension(840,400));

if named frame can do

 name.setpreferredsize(new dimension(840,400));

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