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Interface Queue

public abstract interface Queue
extends Cloneable
See Also:
Stack

Method Index

o clone()
Returns a shallow copy of the queue.
o elements()
Returns an enumeration of the elements in the queue.
o firstElement()
Returns the first element of the queue without removing the element.
o insertFirst(Object)
Insert the specified element into the front of the queue.
o insertLast(Object)
Insert the specified element into the back of the queue.
o lastElement()
Returns the last element of the queue without removing the element.
o removeFirst()
Remove and return an element from the front of the queue.
o removeLast()
Remove and return an element from the back of the queue.
o size()
Returns the number of elements in the queue.

Methods

o lastElement 
 public abstract Object lastElement() throws NoSuchElementException
Returns the last element of the queue without removing the element.

Returns:
the last element
o firstElement 
 public abstract Object firstElement() throws NoSuchElementException
Returns the first element of the queue without removing the element.

Returns:
the first element
o insertFirst 
 public abstract void insertFirst(Object elem)
Insert the specified element into the front of the queue.

Parameters:
elem - element to be inserted
o insertLast 
 public abstract void insertLast(Object elem)
Insert the specified element into the back of the queue.

Parameters:
elem - element to be inserted
o removeFirst 
 public abstract Object removeFirst() throws NoSuchElementException
Remove and return an element from the front of the queue.

Returns:
the element at the front of the queue
Throws: NoSuchElementException
thrown when there are no elements in the queue
o removeLast 
 public abstract Object removeLast() throws NoSuchElementException
Remove and return an element from the back of the queue.

Returns:
the element at the back of the queue
Throws: NoSuchElementException
thrown when there are no elements in the queue
o size 
 public abstract int size()
Returns the number of elements in the queue.

o elements 
 public abstract Enumeration elements()
Returns an enumeration of the elements in the queue.

Returns:
the enumeration
See Also:
Enumeration
o clone 
 public abstract Object clone()
Returns a shallow copy of the queue.

Overrides:
clone in class Object
See Also:
clone 
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