can you help me write this code in java public static void topologicalSort$($List $>$ adj, int V$)$

$\{$

$//$COMPLETE THIS BLOCK

$//$ calculate indegree of each vertex

$//$ BFS$-$Queue to store vertices with indegree $0$

$//$ apply indegree$-$decreasing and inserting in Queue

$//$ Check for cycle or topological order

$//$ Print accordingly to match the sample output.

$\}$

can you explain it how it works thank you