Queue

• Queue - classes LinkedList PriorityQueue
  • poll() - remove front element
  • peek() - get front element
  • add() - add new element in end
  • remove(item) - remove element from front, or a item
  • size()

// traversing elements
Queue<String> pq = new PriorityQueue<>();

pq.add("Geeks");
pq.add("For");
pq.add("Geeks");

Iterator iterator = pq.iterator();

while (iterator.hasNext()) {
    System.out.print(iterator.next() + " ");
}