This method returns the top 10 most used positive words in Eminem's lyrics.

getPositiveWords.txt

	public static List<String> getPositiveWords() throws IOException {
		List<String> outputList = new ArrayList<String>();
		BufferedReader br = new BufferedReader(new FileReader(
				"C:\\positive-words.txt"));
		String line = null;
		while ((line = br.readLine()) != null) {
			outputList.add(line);
		}
		br.close();
		return outputList;
	}

		List<String> globalPositiveWordsList = getPositiveWords();
		String[] inputFilePathArray = new String[4];
		inputFilePathArray[0] = "C:\\input1.txt";
		inputFilePathArray[1] = "C:\\input2.txt";
		inputFilePathArray[2] = "C:\\input3.txt";
		inputFilePathArray[3] = "C:\\input4.txt";
			for (String inputFilePath : inputFilePathArray) {
			BufferedReader br = new BufferedReader(
					new FileReader(inputFilePath));
			String line = null, mapKey = null;
			String[] lineSplitter = null;
			int i = 0;
			while ((line = br.readLine()) != null) {
				for (i = 0; i < lineSplitter.length; i++) {
					mapKey = lineSplitter[i].replaceAll("[\\.\\',\\?]", "");
					if (globalPositiveWordsList.contains(mapKey)) {
						if (positiveWordsMap.containsKey(mapKey))
							positiveWordsMap.put(mapKey,
									positiveWordsMap.get(mapKey) + 1);
						else
							positiveWordsMap.put(mapKey, 1);
					}
			br.close();
		}
		System.out.println("***POSITIVE WORDS***");
		count = 0;
		LinkedHashMap<String, Integer> sortedPositiveWordsMap = sortHashMapByValues(positiveWordsMap);
		for (Entry<String, Integer> entry : sortedPositiveWordsMap.entrySet()) {
			if (count < 10)
				System.out.println(entry.getKey() + " - " + entry.getValue());
			count++;
		}