Threads that work in the background to support the runtime environment are called daemon threads.
Eg garbage collector threads.
When the only remaining threads in a process are daemon threads, the interpreter exits. This makes sense because when only daemon threads remain, there is no other thread for which a daemon thread can provide a service.
You cannot create a daemon method but you can use
public final void setDaemon(boolean isDaemon) method to turn it into one.
