Nastartovat thread sa da len raz, tu je javadoc ku start metode:
Ak chces aby stale bezalo dookola, tak ho neukoncuj.
It is never legal to start a thread more than once.
In particular, a thread may not be restarted once it has completed
execution
Inak potom samozrejme urobit novu instanciu, ako mas v poslednej ukazke...
..ale ten if je tam zbytocny, stale to bude false, kedze si nezavolal start()
na tom novom objekte....
cize staci:
Vlakno vln = new Vlakno();
vln.start();