Median in a stream of integers (running integers)

MedianFinder.java

// https://www.youtube.com/watch?v=VmogG01IjYc
import java.util.Comparator;
import java.util.PriorityQueue;
import java.util.Queue;

class MedianOfIntegerStream {

    public PriorityQueue<Integer> lower;
    public PriorityQueue<Integer> higher;
    
    public MedianOfIntegerStream() 
    {
        lower = new PriorityQueue<Integer>(10, new MaxHeapComparator());
        higher = new PriorityQueue<Integer>(); 
    }
    
    public double getMedian()
    {
        if (lower.size() == higher.size()) {
            return ((double)lower.peek() + (double)higher.peek())/2;
        } else {
            return lower.peek();
        }
    }
    
    public void addNumberToStream(Integer n) 
    {
        if(lower.size() == 0 || n < lower.peek() ){
            // System.out.println(" Adding to Lower " + n);
            lower.add(n);
        } else{
            // System.out.println(" Adding to Higher " + n);
            higher.add(n);
        }
        balance();
    }
    
    public void balance()
    {
        PriorityQueue<Integer> smaller = lower.size() < higher.size() ? lower : higher; 
        PriorityQueue<Integer> bigger  = lower.size() > higher.size() ? lower : higher; 
        
        if((bigger.size() - smaller.size()) >= 2)
        {
             // System.out.println(" Moving Element: " + bigger.peek());
            smaller.add(bigger.poll());    
        }
            
    }
    
    private class MaxHeapComparator implements Comparator<Integer> {
        @Override
        public int compare(Integer o1, Integer o2) {
            return -1 * o1.compareTo(o2);
        }
    }
    
    public void print()
    {
        System.out.println(lower);
        System.out.println(higher);

    }
    
    public static void main(String[] args) {
        MedianOfIntegerStream streamMedian = new MedianOfIntegerStream();
        
        streamMedian.addNumberToStream(1);
        System.out.println(streamMedian.getMedian()); // should be 1
        
        streamMedian.addNumberToStream(5);
        streamMedian.addNumberToStream(10);
        streamMedian.addNumberToStream(12);
        streamMedian.addNumberToStream(2);
        System.out.println(streamMedian.getMedian()); // should be 5
        
        streamMedian.addNumberToStream(3);
        streamMedian.addNumberToStream(8);
        streamMedian.addNumberToStream(9);
        System.out.println(streamMedian.getMedian()); // should be 6.5
    }
}