The program has an option to run threads to perform on either safe-threading or unsafe-threading modes, each being a variation of lazy initialization. I also added an uninstantiated class just for funzies and it behaves similar to the lazy singleton.
When running in unsafe mode, every few runs a thread or two will have a different hashcode, meaning that the getInstance method in the "unsafe" class will create a new instance of that class even if there is already one on the stack.
The thread safe mode has the same hashcode every time seemingly without fail.