Programming Language: Java

I need some one to please explain me these lines of code, maybe you can even rewrite in simpler form so beginner like me can understand. Thanks.

// queue for storing states of knight in board Vector q = new Vector<>(); // push starting position of knight with 0 distance q.add(new cell(knightPos[0], knightPos[1], 0)); 

while (!q.isEmpty()) { t = q.firstElement(); q.remove(0);