Print out object that is in a tree

I am trying to print out the object in a tree. I have a toString method defined for the object. However, I get this error:

I get a classCastException

Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [LPriorityQueueNode;
at PriorityQueue.printPriorityQueue(PriorityQueue.jav a:49)
at driver.main(driver.java:63)

Code :

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System.out.println( tree[0].getElement());

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I think it returns a Node object
try

getElementName() or getElementValue()

to get the name n value of node,I m not sure weather it works or not

Regards
Sai