//constructor
public HeapTreeImplementation(HeapPriorityType priorityType)
{
_nodeCount = 0;
_priorityType = priorityType;
_rootNode = new HeapNode <K, T>(null, priorityType);
}
//constructor
public HeapNode(HeapNode <K, T> parent, HeapPriorityType priority)
{
_parent = parent;
_priority = priority;
}