Queue

Take a look at the following code with a queue:

Queue<Integer> q = new LinkedList<>();
q.offer(100);
q.offer(200);
q.peek();
q.offer(300);
q.poll();
q.offer(400);
q.peek();

What elements does the queue contain after executing the code above?

Enter all values from left (the first) to right (the last) separated by spaces.