The pack
method sizes the frame so that all its contents are at or above their preferred sizes. An alternative to pack is to establish a frame size explicitly by calling setSize
or setBounds
(which also sets the frame location). In general, using pack is preferable to calling setSize
, since pack leaves the frame layout manager in charge of the frame size, and layout managers are good at adjusting to platform dependencies and other factors that affect component size.
From Java tutorial
You should also refer to Javadocs any time you need additional information on any Java API
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