maintain the median with heaps 4

mmwh4.java

public double getMedian() {
  int size = minHeap.size() + maxHeap.size();
	double median = Integer.MAX_VALUE;
	if(size % 2 == 0)
	{
		if(!minHeap.peek()) median = maxHeap.peek();
		else if(!maxHeap.peek()) median = minHeap.peek();
		else median = ((double) minHeap.peek() + maxHeap.peek()) / 2;
	}
	else
	{
		median = (maxHeap.size() >= minHeap.size()) ? maxHeap.peek() : minHeap.peek();
	}
	return median;
}