I've tried implementing various methods from around the internet, all seem to be providing the same solution. But it just won't work and I'm unsure why, it creates the file, however, it's blank and if I try loading that file, it has an error.

Main.java contains the code to save and load the file: 190-224.

Rooms.java contains the object.

Code

Any help is greatly appreciated, I've been trying for almost a week now! Thanks in advanced!