enqueue and dequeue in java

in java, the terms "enqueue" and "dequeue" are commonly associated with the queue data structure, which follows the first-in-first-out (fifo) principle. this means that the first element added to the queue will be the first one to be removed.

overview of queue

common implementations

1. **linkedlist**: this class implements the `queue` interface and provides a linked list-based implementation.
2. **priorityqueue**: this class implements a priority queue, where elements are ordered based on their natural ordering or by a custom comparator.

basic operations

- **enqueue**: adding an element to the back of the queue.
- **dequeue**: removing an element from the front of the queue.
- **peek**: getting the front element without removing it.
- **isempty**: checking if the queue is empty.

example code

here’s a simple example demonstrating how to use a `queue` in java with a `linkedlist` implementation:

explanation of the code

2. **queue creation**: we create a `queue` instance using `linkedlist`.

3. **enqueue operation**:
- we use the `offer()` method to add elements to the queue. this method returns `true` if the element was added successfully.
- we loop from 1 to 5, adding each integer to the queue and printing the operation.

4. **display current queue**: after enqueueing elements, we print the current contents of the queue.

5. **dequeue operation**:
- we use the `poll()` method to remove elements from the queue. this method returns `null` if the queue is empty, so it's safe to call without checking.
- we loop until the queue is empty, removing and printing each dequeued element.

6. **final st ...

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