A DESCRIPTION OF THE REQUEST :
As JFileChooser provides most essential methods to acquire files, it seems like it doesn't support multiple file selection with mouse drag.

As example, most native file choosers allows you to drag with your mouse, creating a blue square if you're on windows that allows multiple file selection. JFileChooser currently doesn't support that feature.

JUSTIFICATION :
Most users of applications that features file choosers will expect this feature.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
To see that JFileChoosers act like a native file chooser that allows multiple file selection with mouse drag selection.
ACTUAL -
JFileChooser doesn't support multiple file selection with mouse drag.