Queue Using LL || LinkedList || coding ninjas || java
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Queue Using LL
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Implement a Queue Data Structure specifically to store integer data using a Singly Linked List.
The data members should be private.
You need to implement the following public functions :
1. Constructor:
It initialises the data members as required.
2. enqueue(data) :
This function should take one argument of type integer. It enqueues the element into the queue and returns nothing.
3. dequeue() :
It dequeues/removes the element from the front of the queue and in turn, returns the element being dequeued or removed. In case the queue is empty, it returns -1.
4. front() :
It returns the element being kept at the front of the queue. In case the queue is empty, it returns -1.
5. getSize() :
It returns the size of the queue at any given instance of time.
6. isEmpty() :
It returns a boolean value indicating whether the queue is empty or not.
Operations Performed on the Stack:
Query-1(Denoted by an integer 1): Enqueues an integer data to the queue.
Query-2(Denoted by an integer 2): Dequeues the data kept at the front of the queue and returns it to the caller.
Query-3(Denoted by an integer 3): Fetches and returns the data being kept at the front of the queue but doesn't remove it, unlike the dequeue function.
Query-4(Denoted by an integer 4): Returns the current size of the queue.
Query-5(Denoted by an integer 5): Returns a boolean value denoting whether the queue is empty or not.
Sample Input 1:
7
1 17
1 23
1 11
2
2
2
2
Sample Output 1:
17
23
11
-1
Sample Input 2:
3
2
1 10
4
Sample Output 2:
-1
1
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