Edge triggered Flip-Flop

The above diagram shows a positive edge triggered flip-flop. The truth table is as follows

$J$	$K$	$Q_{n+1}$	$\overline{Q_{n+1}}$
0	1	0	1
1	0	1	0
0	0	$Q_n$	$\overline{Q_n}$
1	1	$\overline{Q_n}$	$Q_n$