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poll() problem

 
Greenhorn
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why above program shows bye 2 followed by ConcurrentModificationException
but below program compile fine

 
Ranch Hand
Posts: 5575
Eclipse IDE Windows XP Java
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poll method Retrieves and removes the head of this queue . so when you remove an element from collection at the time of looping you get ConcurrentModificationException. to remove an element while looping use Iterator instead.
 
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