I don't program in Java but I know that Java provides for the programmatic creation of the UI AND provides some wonderful Layout Management components (Native to Java without requiring SWING). I first got exposed to Layout Managers back in the good-old-days of X11 with X Toolkits (anybody remember Motif, OpenLook, HP Open View?) and Java seems to have adopted similar technology.
You can create Windows, Dialogs and Menus all from simple layout managers.
