Queue (Data Structures and Algorithms, and Client Programs from Algorithms by Robert Sedgewick and Kevin Wayne)

All Superinterfaces:

Iterable<Item>

All Known Implementing Classes:

LinkedQueue, ResizingArrayQueue
```
public interface Queue<Item>
extends Iterable<Item>
```
This interface specifies the API for the queue data structure.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Item`	`dequeue()`	Removes and returns the item at the front of this queue.
`void`	`enqueue(Item item)`	Adds `item` to the end of this queue.
`boolean`	`isEmpty()`	Returns `true` if this queue is empty, and `false` otherwise.
`Item`	`peek()`	Returns the item at the front of this queue.
`int`	`size()`	Returns the number of items in this queue.

Methods inherited from interface java.lang.Iterable
forEach, iterator, spliterator

- Method Detail
  - isEmpty
```
boolean isEmpty()
```
    Returns true if this queue is empty, and false otherwise.
    
    Returns:
    
    true if this queue is empty, and false otherwise.
  - size
```
int size()
```
    Returns the number of items in this queue.
    
    Returns:
    
    number of items in this queue.
  - enqueue
```
void enqueue(Item item)
```
    Adds item to the end of this queue.
    
    Parameters:
    
    item - the item.
  - peek
```
Item peek()
```
    Returns the item at the front of this queue.
    
    Returns:
    
    item at the front of this queue.
  - dequeue
```
Item dequeue()
```
    Removes and returns the item at the front of this queue.
    
    Returns:
    
    item at the front of this queue.