Now, I normally use nested panels to organise my layout, rather than main containers. However, check out some of the layout managers that implement the FlowLayout interface (particularly FlowLayout). I find it particularly useful with components that have both fixed and variable widths, such as buttons and text fields.
Also, read up on how to pack components, and flow layouts in general.
If you're interested, I wrote an ebook on how to set up a custom graphical user interface 50e0806aeb jamniag
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