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PriorityQueue

 
Greenhorn
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Ranch Hand
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just go through it..
http://java.sun.com/j2se/1.5.0/docs/api/java/util/PriorityQueue.html

peek: Retrieves, but does not remove, the head of this queue, returning null if this queue is empty.

poll : Retrieves and removes the head of this queue, or null if this queue is empty.

offer : Inserts the specified element into this priority queue.

try some example also.. to understand fully.
 
mo shaik
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