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Java Source Code / Java Documentation » Library » Apache common Collections » org.apache.commons.collections

Source Cross Reference Class Diagram Java Document (Java Doc)

org.apache.commons.collections .PriorityQueue

All known Subclasses:   org.apache.commons.collections .BinaryHeap,  org.apache.commons.collections .SynchronizedPriorityQueue,
PriorityQueue
public interface PriorityQueue (Code)
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: 155406 $ $Date: 2005-02-26 12:55:26 +0000 (Sat, 26 Feb 2005) $
author:
   Peter Donald

Method Summary
void clear()
     Clear all elements from queue.
void insert(Object element)
     Insert an element into queue.
Parameters:
  element - the element to be inserted
throws:
  ClassCastException - if the specified element'stype prevents it from being compared to other items in the queue todetermine its relative priority.
boolean isEmpty()
     Test if queue is empty.
Object peek()
     Return element on top of heap but don't remove it.
Object pop()
     Return element on top of heap and remove it.

Method Detail
clear
void clear()(Code)
Clear all elements from queue.

insert
void insert(Object element)(Code)
Insert an element into queue.
Parameters:
  element - the element to be inserted
throws:
  ClassCastException - if the specified element'stype prevents it from being compared to other items in the queue todetermine its relative priority.

isEmpty
boolean isEmpty()(Code)
Test if queue is empty. true if queue is empty else false.

peek
Object peek()(Code)
Return element on top of heap but don't remove it. the element at top of heap
throws:
  java.util.NoSuchElementException - if isEmpty() == true

pop
Object pop()(Code)
Return element on top of heap and remove it. the element at top of heap
throws:
  java.util.NoSuchElementException - if isEmpty() == true

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