How to detect if a graphical interface is supported?

Question

I need my Java program to have two display modes: a GUI interface and a command line interface. If I run it in Windows, OS X, or another graphical environment I should get

Answer 1

I recommend adding a command line option that determines whether to use command-line or graphical user interface, because the user may want to use the command-line interface even in the environment where GUI is available.

You can also check if console device is available or not with System.console().