private void computeWordFrequencies() throws IOException{
		out = new BufferedWriter(new FileWriter("alphaSorted.txt"));
		Set<Map.Entry<String, Integer>> wordSet = createTreeMap(wordList).entrySet();
		for(Map.Entry<String, Integer> entry: wordSet){
			out.write(entry.getKey() + " " + entry.getValue());
			out.newLine();
		}
		out.close();
	}

private TreeMap<String, Integer> createTreeMap(ArrayList<String> wordList){
		TreeMap<String, Integer> wordMap = new TreeMap<String, Integer>();
		for(String str : wordList){
			if(wordMap.containsKey(str)){
				wordMap.put(str, wordMap.get(str) + 1);
			}else{
				wordMap.put(str, 1);
			}
		}
		return wordMap;
	}