install4j offers also an unattended mode, something that may be very handy when you have to install a program the same way on different computers. In that mode launched with a -q argument passed to the installer program, the installation runs by itself until the end without asking any questions.
The directory where the program should be installed can be specified with the -dir argument and the answers to the installer questions that should be different from their default values can be specified in a response file by passing the -varfile argument.

The easiest way to generate such a response file is to run the program in another mode and retrieve the response.varfile file created by the installer in the .install4j subdirectory of the directory where program was installed.
This file is a text file that contains installer variables and their values that may be edited with any text editor if needed.