multithreading - How do you hang a thread in Java in one line?

Question

By one line I mean at most 100 chars per line.

(I basically need this to keep the program alive. The main thread registers callback listeners that are run in separate threads. I just need the main one to hang forever and let the other threads do their work)

Answer 1

synchronized(this) {
    while (true) {
        this.wait();
    }
}

(thanks to Carlos Heuberger. Exception handling omitted in the above code)

This will make the current thread wait on the monitor of the current class until someone calls notify(), or forever.