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The person who comes first, will get the ticket first. For the same reason queue is also called \", mdx(\"strong\", {\n    parentName: \"p\"\n  }, \"First In First Out (FIFO)\"), \" data structure.\"), mdx(\"h4\", {\n    \"id\": \"important-functions-in-queue\"\n  }, \"Important functions in Queue\"), mdx(\"p\", null, \"If we talk about very simple queue, then there are very limited functions a queue has.\"), mdx(\"p\", null, mdx(\"strong\", {\n    parentName: \"p\"\n  }, \"enqueue():\"), \" This pushes the element at the end of the queue.\"), mdx(\"p\", null, mdx(\"strong\", {\n    parentName: \"p\"\n  }, \"dequeue():\"), \" This removes and returns the element from the beginning of the queue.\"), mdx(\"p\", null, mdx(\"strong\", {\n    parentName: \"p\"\n  }, \"size():\"), \" This returns the current size of the queue.\"), mdx(\"h4\", {\n    \"id\": \"queue-implementation\"\n  }, \"Queue Implementation\"), mdx(\"p\", null, \"Queue can be implemented using array or linkedlist.\\nWe will use linkedlist to implement queue for below reasons:\"), mdx(\"ol\", null, mdx(\"li\", {\n    parentName: \"ol\"\n  }, \"No limit on queue capacity\"), mdx(\"li\", {\n    parentName: \"ol\"\n  }, \"Shifting elements is costly in array, we can avoid that when we dequeue elements\")), mdx(\"pre\", null, mdx(\"code\", _extends({\n    parentName: \"pre\"\n  }, {\n    \"className\": \"language-java\"\n  }), \"class Node {\\n    int data;\\n    Node next;\\n    public Node(int data) {\\n        this.data = data;\\n        this.next = null;\\n    }\\n}\\n\\npublic class Queue {\\n    int size;\\n    Node front;\\n    Node rear;\\n\\n    public Queue() {\\n        size = 0;\\n        front = null;\\n        rear = null;\\n    }\\n\\n    public void enqueue(int data) {\\n        Node node = new Node(data);\\n        if(front == null) {\\n            front = node;\\n            rear = node;\\n            size = size+1;\\n        }\\n        rear.next = node;\\n        rear = rear.next;\\n        rear.next = null;\\n        size = size+1;\\n    }\\n\\n    public int dequeue() {\\n        int data = front.data;\\n        front = front.next;\\n        size = size-1;\\n        return data;\\n    }\\n    public int size() {\\n        return size;\\n    }\\n\\n    public void printQueue() {\\n        Node temp = front;\\n        while(temp != null) {\\n            System.out.print(temp.data+\\\" \\\");\\n            temp = temp.next;\\n        }\\n    }\\n\\n    public static void main(String[] args) {\\n        Queue queue = new Queue();\\n        queue.enqueue(10);\\n        queue.enqueue(20);\\n        queue.enqueue(30);\\n        queue.printQueue();\\n        System.out.println();\\n        System.out.println(\\\"de-queued = \\\"+queue.dequeue());\\n        queue.printQueue();\\n        System.out.println();\\n        System.out.println(\\\"Current queue size=\\\"+ queue.size());\\n    }\\n}\\n\")), mdx(\"h4\", {\n    \"id\": \"console-output\"\n  }, \"Console output\"), mdx(\"pre\", null, mdx(\"code\", 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