# Queue
- The Queue interface is present in the `java.util` package.
- It is an ordered list of objects that follows the **FIFO** (First-In-First-Out) principle.

## Characteristics of a Queue
- The Queue is used to insert elements at the end of the queue and removes elements from the beginning of the queue.
- It supports all methods of Collection interface including insertion, deletion etc.
- LinkedList, ArrayBlockingQueue and PriorityQueue are the most commonly used implementations.

## Declaration

`Queue<Obj> queue = new PriorityQueue<Obj> ();` 

## Important operations

| Operations | Description |
| ----------- | ----------- |
|Enqueue|Adds an item to the queue|
|Dequeue|Removes an item from the queue|
|Front|Gets the front item from the queue|
|Rear|Gets the last item from the queue|