Welcome to the Ranch
I presume you get an output from that code? No, you won't because you haven't given a valid file name. You can't pass "" as a file name. You have to use a name of a real file. If you are using Window®, remember the file separator is \ and you can't write \ so you have to write \\ in the String for the file name instead.
Try a real file name and see what happens. I think that will work nicely if you get a real file name.
Once you are printing the lines, you know you have got your hands on them and you can add them to the List easily in that loop. Also make sure you close the Scanner after you have finished reading. Use
what the Java® Tutorials suggest to make sure it is closed.
You didn't quite get the code tags right, but I'll correct that for you.