Is there a layout manager that gives the same degree of control as Absolute Positioning? But also makes auto resizing possible? Something where you could place elements usi
GridBagLayout is the most flexible standard layout manager in Swing and it can achieve practically anything you need, although nowhere near as simply as how you imagine by just using relative coordinates (what you mean, I guess, is 0-100% relative to the frame size).
You may find the official documentation for GridBagLayout
here, which also has some figures and examples.
You can also check out the open-source MiG Layout, which is much more convenient that GridBagLayout
and also a bit more powerful. It is the mother of all layout managers.