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    <p>Google's <a href="http://code.google.com/p/guava-libraries/" rel="nofollow">Guava Libraries</a> have some very useful utilities and data structures for this sort of problem.</p> <p>To split up the file into words you can use Splitter:</p> <pre><code>Iterable&lt;String&gt; wordsInFile = Splitter.on(' ').trimResuls().omitEmptyStrings().split(fileAsString);</code></pre> <p>To count up the occurrences of a given word, you can use Multiset:</p> <pre><code>Multiset&lt;String&gt; countOfEachWord = HashMultiset.create(); countOfEachWord.addAll(wordsInFile);</code></pre> <p>You could build on these two pieces to create some kind of object like a WordLookupTable. ie:</p> <pre><code>public class WordLookupTable { private static final Splitter SPLITTER = Splitter.on(' ').trimResults().omitEmptyStrings(); private final Map&lt;String, Multiset&lt;String&gt;&gt; filenameToWordCountSet = Maps.newHashMap(); public void addFile(String filename, String fileText) { Multiset&lt;String&gt; wordsInFile = getWordSetForFile(filename); for (String word : SPLITTER.split(fileText)) { wordsInFile.add(word); } } // Gets the count of all words for the file public long getCountOfWordsForFile(String filename) { return getWordSetForFile(filename).size(); } public long getCountOfWordInFile(String filename, String word) { return getWordSetForFile(filename).count(word); } public long getCountOfWordOverAllFiles(String word) { long count = 0; for (Multiset&lt;String&gt; wordSet : filenameToWordCountSet.values()) { count += wordSet.count(word); } return count; } private Multiset&lt;String&gt; getWordSetForFile(String filename) { Multiset&lt;String&gt; wordsInFile = filenameToWordCountSet.get(filename); if(wordsInFile == null) { wordsInFile = HashMultiset.create(); filenameToWordCountSet.put(filename, wordsInFile); } return wordsInFile; } }</code></pre>
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