Turn java cmdline program into GUI

I have a java command line program from a vendor without source code, but it's too much work to run on a PC window, therefore I'm think to create a GUI wrapper or web interface calling that java cmdline program. But I'm a newbie in java world

  • How convert a java command line program into a web interface (applet) or GUI?
  • How difficult or easy to write a GUI in java calling the command line program for PC?

Your help would be very appreciated!