When all of the tabs added to a JTabbedPane do not fit on a single
row, extra rows of tabs are created. Many users and developers have
observed that one row of tabs is easy to use but two or more can be
confusing. This may be because the physical analogy to a stack of
folders starts to unravel when there's more than one row of tabs, or
simply because finding a single tab label in a grid is more taxing
than finding a label on single line. Providing an arrangement of tabs
that's easier to use when all of the tabs don't fit on a single row is
important because many applications create tabs dynamically and can't
easily ensure that they'll all fit on a single row. We plan to extend
JTabbedPane to support another layout option for this case, for
example a single scrollable row of tabs.