code: public void trimToSize() {
  		modCount++;
  		while ((bucketDepth > 0) && (bucketSize << ((bucketDepth-1)*bucketExp) >= size)) {
  			bucket = (Object[]) bucket[0];
  		}
  	}
docs: Trims the capacity of this <tt>BucketArrayList</tt> instance to be the
  list's current size.  An application can use this operation to minimize
  the storage of an <tt>BucketArrayList</tt> instance.