Package org.apache.commons.collections

Interface PriorityQueue

All Known Implementing Classes:

BinaryHeap, SynchronizedPriorityQueue

public interface PriorityQueue

Deprecated.

Replaced by the Buffer interface and implementations in buffer subpackage. Due to be removed in v4.0.

Defines a collection for priority queues, which can insert, peek and pop.

This interface is now replaced by the Buffer interface.

Since:

Commons Collections 1.0

Version:

$Revision: 646777 $ $Date: 2008-04-10 14:33:15 +0200 (Thu, 10 Apr 2008) $

Author:

Peter Donald

Method Summary

Modifier and Type	Method	Description
void	clear()	Deprecated. Clear all elements from queue.
void	insert(java.lang.Object element)	Deprecated. Insert an element into queue.
boolean	isEmpty()	Deprecated. Test if queue is empty.
java.lang.Object	peek()	Deprecated. Return element on top of heap but don't remove it.
java.lang.Object	pop()	Deprecated. Return element on top of heap and remove it.

Method Detail

clear

void clear()

Deprecated.

Clear all elements from queue.

isEmpty

boolean isEmpty()

Deprecated.

Test if queue is empty.

Returns:

true if queue is empty else false.

insert

void insert(java.lang.Object element)

Deprecated.

Insert an element into queue.

Parameters:

element - the element to be inserted

Throws:

java.lang.ClassCastException - if the specified element's type prevents it from being compared to other items in the queue to determine its relative priority.

peek

java.lang.Object peek()

Deprecated.

Return element on top of heap but don't remove it.

Returns:

the element at top of heap

Throws:

java.util.NoSuchElementException - if isEmpty() == true

pop

java.lang.Object pop()

Deprecated.

Return element on top of heap and remove it.

Returns:

the element at top of heap

Throws:

java.util.NoSuchElementException - if isEmpty() == true