Need help creating a BFS using Points in Java

I'm having trouble understanding how to implement the BFS.(I do know how it works i just cant get my head around doing this in java).
This code is to do with an AI snake.
I am able to make it move strait to the goal but it does not avoid the walls.

In my method I am passing through:

In my Class I have already passed through the goal Point.

The beginning of my BFS Method is below:

public void BFSQ(ArrayList ClosedList,Point SnakeHead){

LinkedList<Point> Viseted = new LinkedList<>();
Queue queue = new LinkedList();
((LinkedList) queue).add(SnakeHead);
Viseted.add(SnakeHead);
while(!queue.isEmpty()){
Point temp = new Point();
temp= (Point) queue.remove();

/*this is where Im having troubles. i don't know how i would approach the loop

*/


}


}

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