public String getFrequencyMap() {
		if (charFrequencyMap == null) 
			return "No entries in the map";
		else
			return new TreeMap<Character,Integer>(charFrequencyMap).toString();
}

============

public String getCharToHuffmanMap(){
		if (charToHuffmanCodeMap == null)
			return "No entries in the map";
		else
			return new TreeMap<Character,String>(charToHuffmanCodeMap).toString();
}